COIN Help U Community

Mon Oct 11, 2021 6:27 pm 👀 IMMEDIATE ANSWERS: Step by step find your Doubled Die or RPM online! 👀 Mon Oct 11, 2021 6:27 pm 👀 IMMEDIATE ANSWERS: Step by step find your Doubled Die or RPM online! 👀
You should use this method for every coin you find that you think is a doubled die or an RPM. If you do not find yours there, then your coin is not the error you are asking about. It is likely damage or some form of non-collectable doubling such as machine doubling.

In the following example, we are looking to see if our 1977-D cent is a doubled die. This method works for any modern US coin.

First go to varietyvista.com and scroll down
Variety Vista Home1-2.jpg

You will now see the following - select which coin you are looking up and the proper range for the date In this case a 1977-D cent):
Variety Vista Home3.jpg


You will see the following now. Choose the DDO button to show ALL DDOs for Lincoln cents.
Variety Vista Home4.jpg

You will see the following. Scroll down to find the proper date and mint mark (1977-D):
Variety Vista Home5.jpg

When you scroll you will see 1977-D - click there
Variety Vista Home6.jpg

There is only ONE known DDO for 1977-D b/c, as you can see, only DDO-001 is listed there. If there were more than one for this date, they would also be on that page.
Variety Vista Home7.jpg
Click on the DDO-001 to see all pictures for this DDO


Scroll to see more pictures of the DDO-001. Yours much match ALL the pictures to be the DDO-001.
Variety Vista Home8.jpg

If yours does not match all the pictures, then yours is not the DDO. If you think you see doubling anyway, then you probably have a coin with machine doubling on it or some other kind of non-collectable doubling

It is this simple for all of the coins you want to check.
Please do this with ALL of your coins before you post them and ask if they are a doubled die or an RPM.

If the coin's date and mint mark has many doubled dies listed, such as DDO-001, DDO-002, DDO-003 etc. The check DDO-002 to see if yours matches all the DDO-002 pictures. If not, then try DDO-003, etc.

Sat May 21, 2022 1:36 am 📷 Coin photography set up - cheap and easy! 📚 Sat May 21, 2022 1:36 am 📷 Coin photography set up - cheap and easy! 📚
Easy coin photo setup.
Note - the pictured ring light is OPTIONAL, but works well - use any good light source

Spend the very few seconds it will take to read the print in the picture or you will still get fuzzy pictures.

How_to_Take_Coin_Pics_Setup_Result.jpg

NOTE: A stack of dimes works well in place of the bottle cap for smaller coins like pennies. Whatever you elevate your coin with must be totally hidden from the camera's view and make it look like the coin is floating by itself above the table. Only then will the camera be forced to focus on nothing but the coin.



You can see the coin on the screen of the camera in the following setup. That very picture of the REV is included below:

The picture seen on the camera in the photo (cropped after taken):
1920-D_WALKER_REV.PNG



And the OBV:
1920-D_WALKER_OBV.png

Lighting note: [/u] A layer of tissue (or multiple layers) in front of a light source (like a lamp, LEDs etc.) will diffuse light and eliminate glare. Use trial and error with your specific setup until you get what you want.

Our member Paul says he uses a cut out piece of milk jug to diffuse light. I have not tried it with my ring light, but am thinking if the light needs diffusion, the milk jug circle would alleviate having to cut out rings of tissue every time someone wanted to take pics of coins.

Fri Oct 09, 2020 8:36 am How To Post Images, Questions & Make a Meaningful Title In This Community Fri Oct 09, 2020 8:36 am How To Post Images, Questions & Make a Meaningful Title In This Community
When you're posting in this forum remember these things:
Start your own topic, so please don't post your coin or question in another person's topic.
Remove your coin from the holder.
Post ONLY one coin per topic, we don't need comparison images.
Crop your image and take as clear of an image as possible.
Don't post camera pictures of microscope screens - these are pixellated and hide details when zoomed in * SEE BELOW to find out how (after video link).
You need to post post ( 1 ) a full OBV picture, ( 2 ) a full REV picture, ( 3 ) and picture(s) of the area on your coin you are asking about).
Also be descriptive in your title AND question about your coin. Include date, mint, coin type, denomination and the specific characteristic on the coin that prompted you to ask your question.
Lastly, please watch the video below! [/size]

The video shows how to attach only 1 photo. Use the same method but select
all 3 of your photos when posting a question.


https://youtu.be/nmYO03YzFtU


* Connect microscope to your computer and use a screenshot, or your microscope should have a memory card slot to save/transfer to your computer to then take a screenshot.

Wed Jul 06, 2022 8:52 pm Do You Have A Mint Error? CLICK HERE! Wed Jul 06, 2022 8:52 pm Do You Have A Mint Error? CLICK HERE!

Mon Jun 19, 2023 11:01 pm Helpfull links for all. Mon Jun 19, 2023 11:01 pm Helpfull links for all.
I will post here my list of helpful links on line for lovers of this Hobby. This list has as father the Lance Williams. Me I add over and over and now I work to add the links from my Data base of the all the Mint Reports and hearings of the Mint in front of the Congress. I hope Daniel will made a stiker on , so all could access free on theirs pace.

THE LIST:

Comprehensive Sites - 1909-Present
http://varietyvista.com
http://doubleddie.com/ - Wexler's Die Varieties
https://koinpro.tripod.com/ - ken potter - scroll down for great info
1/2c
https://nnp.wustl.edu/library/book/555403 - NNP: American Half Cents: The "Little Half Sisters" (Second Edition) - Roger S. Cohen, Jr. (1982)
1c
http://coppercoins.com
https://early-copper.com/ - looks useful ?
http://lincolncentresource.com
https://nnp.wustl.edu/library/book/530759 - NNP: The Cent Book: 1816-1839 - Wright, John D. (1992)
Updates:
https://nnp.wustl.edu/library/book/614807 - Cent Book (1825 N-25 Insert) - Wright, John D. (2022)...
https://nnp.wustl.edu/library/book/614808 - Cent Book (1839 N-5, N-10 Insert) - Wright, John D. (2022)...
https://nnp.wustl.edu/library/book/614809 - Cent Book (Errata) - Wright, John D. (2022)...
https://nnp.wustl.edu/library/book/586931 - NNP: Die Varieties of United States Large Cents - Grellman, John Robert (2020)
2c
3c
https://nnp.wustl.edu/library/book/555545 - NNP The Ultimate Guide to US Three Cent Nickels 1865 to 1889, Allan Gifford (2003)
H10c
https://518616078926146539.weebly.com - Capped Bust Half Dimes (on site Weebly) appears someone put together this info and acknowledges at bottom.
https://nnp.wustl.edu/library/book/555401 - NNP: The Complete Guide to Liberty Seated Half Dimes - Al Blythe (1992)
https://nnp.wustl.edu/library/book/581451 - NNP: Liberty Seated Half Dime - Top 100 Varieties Set - Cummins, Clint (2020)
5c
http://shieldnickels.net/
https://nnp.wustl.edu/library/book/555394 - NNP: The Complete Guide to Shield & Liberty Head Nickels - Gloria Peters, Cynthia Mohon (1995)
https://nnp.wustl.edu/library/book/555290 - NNP: The Complete Guide to Buffalo Nickels - David W. Lange (1992)
https://nnp.wustl.edu/library/book/526116 - NNP: Buffalo Nickels: The Abraded Die Varieties - Pope, Ron (2006)
10c
http://richardsrooseveltreview.net/
http://seateddimevarieties.com/index.htm - Liberty Seated Dimes - Die Varieties, 1837 - 1891, Gerry Fortin
https://nnp.wustl.edu/library/book/555400 - NNP: The Complete Guide to Liberty Seated Dimes - Brian Greer (1992)
https://nnp.wustl.edu/library/book/555294 - NNP: The Complete Guide to Barber Dimes - David Lawrence (1991)
https://nnp.wustl.edu/library/book/555399 - NNP: The Complete Guide to Mercury Dimes - David W. Lange (1993)
20c
http://doubledimes.com/Book-cover.html - The United States Twenty Cent Piece, Brunner and Frost
25c
https://nnp.wustl.edu/library/book/555291 - NNP: The Complete Guide to Barber Quarters, Second Edition - David Lawrence (1994)
https://nnp.wustl.edu/library/book/555293 - NNP - the Complete Guide To Barber Quarters
https://nnp.wustl.edu/library/book/555397 - NNP: The Complete Guide to Washington Quarters - John Feigenbaum (1994)
50c
http://maibockaddict.com - The Early Half Dollar Information Site (Flowing Hair, Draped Bust, Capped Bust)
http://franklinlover.yolasite.com
https://nnp.wustl.edu/library/book/555396 - NNP: The Complete Guide to Liberty Seated Half Dollars - Randy Wiley, Bill Bugert (1993)
https://nnp.wustl.edu/library/book/529686 - NNP: A Register of Liberty Seated Half Dollar Varieties, Volume I, San Francisco Branch Mint - Bugert, William B(arton) (2009)
https://nnp.wustl.edu/library/book/529687 - NNP: A Register of Liberty Seated Half Dollar Varieties, Volume II, Carson City Branch Mint - Bugert, William B(arton) (2010)
https://nnp.wustl.edu/library/book/529688 - NNP: A Register of Liberty Seated Half Dollars, Volume III, New Orleans Branch Mint 1840-O to 1853-O NA - Bugert, William B(arton) (2011)
https://nnp.wustl.edu/library/book/529689 - NNP: A Register of Liberty Seated Half Dollar Varieties, Volume IV, New Orleans Branch Mint 1853-O WA to 1861-O - Bugert, William B(arton) (2013)
https://nnp.wustl.edu/library/book/585798 - NNP: A Register of Liberty Seated Half Dollar Varieties, Volume V - Bugert, William B(arton) (2016)
https://nnp.wustl.edu/library/book/555292 - NNP: The Complete Guide to Barber Halves - David Lawrence (1991)
https://nnp.wustl.edu/library/book/555398 - NNP: The Complete Guide to Franklin Half Dollars: Updated Second Edition - Rick Tomaska (2002)
$1 Silver & non-gold
http://earlydollars.org/index.asp - Presented by Cardinal Collection Educational Foundation
http://vamworld.com/wiki/Home - VAM World, Morgan and Peace Dollar VAM's
http://ec2-13-58-222-16.us-east-2.compute.amazonaws.com/wiki/Home
http://smalldollars.com/ - useful, goes here?
http://www.seateddollarvarieties.com/index.shtml - A Register of Liberty Seated Dollar Varieties - By jerk Osburn and Brian Cushing.
https://nnp.wustl.edu/library/book/601210 - NNP: Silver Dollars & Trade Dollars of the United States: A Complete Encyclopedia Vol. 1 - Q. David Bowers (1993)
https://nnp.wustl.edu/library/book/601211 - NNP: Silver Dollars & Trade Dollars of the United States: A Complete Encyclopedia Vol. 2 - Q. David Bowers (1993)
$1 Gold
$2.5
$3
$5
$10
$20
(1)https://nnp.wustl.edu/library/book/559680 - NNP: Type I Double Eagles, 1850-1866 - Douglas Winter, Adam Crum (2002)
https://nnp.wustl.edu/library/book/559681 - NNP: Type Two Double Eagles 1866-1876, Second Edition - Douglas Winter, Michael Fuljenz (1999)
Gold By Mint
https://nnp.wustl.edu/library/book/559683 - NNP: Gold Coins of the Carson City Mint - Douglas Winter (2001)
https://nnp.wustl.edu/library/book/559678 - NNP: Gold Coins of the Dahlonega Mint 1838-1861, Second Edition - Douglas Winter (2003)
https://nnp.wustl.edu/library/book/559677 - NNP: Gold Coins of the New Orleans Mint 1839-1909, Second Edition - Douglas Winter (2006)
https://nnp.wustl.edu/library/book/559675 - NNP: Gold Coins of the Old West: The Carson City Mint 1870-1893 - Douglas Winter, Lawrence E. Cutler (1994)
Catalogs - Auction, other?
Colonial
https://coins.nd.edu/ColCoin/ColCoinContents/Introduction.html
https://coins.nd.edu/fugio/Newman1-24/ - From Stone's List
https://coins.nd.edu/title.html
Books/Supplies/
http://collectorscorner.org
http://danscoalbumstore.com
https://abebooks.com/servlet/SearchResults?vci=53552&vcat=Numismatics&vcatn=Numismatics
https://amosadvantage.com
https://coinbooks.org
https://forums.collectors.com/home/leaving?allowTrusted=1&target=https://brooklyngallery.com/coin-books.html
https://jakesmp.com/Coin-Supplies_c_790.html
https://jpscorner.com
https://numislit.com
https://valleycoin.com/supplies-books-cd-dvd-s.html
https://whitman.com/
https://wizardcoinsupply.com
Coin Info Melt/Size/Weight etc
https://coinflation.com
http://coininfo.com
Census Threads on Slab Generations-Various
https://forums.collectors.com/discussion/977463/the-official-pcgs-white-label-rattler-census-71-listed-as-of-11-22-19
https://forums.collectors.com/discussion/967317/the-new-doily-census-2016
https://forums.collectors.com/discussion/785123/ngc-black-slab-census-now-42-documented
https://forums.collectors.com/discussion/842362/the-official-ngc-1-0-2-0-and-2-1-slab-population-census-197-2-1s-listed
Counterfeit
http://rg.ancients.info/bogos - Bogos Counterfeit Coins
http://cccbhcc.com - Contemporary Counterfeit Capped Bust Half Collectors Club
(Sept 2022 above web page says to go to "www.badmetalcoin.com" )
https://forums.collectors.com/discussion/1082973/the-unofficial-reporting-post-for-fake-pcgs-slabs
A look at a counterfeit operation
http://ncna.club/wp-content/uploads/2019/05/Counterfeit-Coins-Article.pdf
https://www.money.org/uploads/Counterfeit Detection Vol.1.pdf
https://www.money.org/uploads/Counterfeit Detection Vol.2.pdf
Counterfeit info/reporting
http://numismaticcrimes.org - Numismatic Crime Information Center (Doug Davis)
https://acefonline.org - Anti-Counterfeiting Educational Foundation (Anti-Counterfeiting Task Force)
https://www.money.org/consumer-awareness - ANA Consumer Awareness Resources page (CARE)
Counterfeit PCGS slab information
https://forums.collectors.com/discussion/1075720/the-pcgs-counterfeiters-are-getting-too-good-watch-out
Counterstamps/Maker'sMarks
https://us.v-cdn.net/6027503/uploads/editor/pz/f068bt3kqdte.png
Errors
http://cuds-on-coins.com - Broken Die Errors
http://maddieclashes.com - MAD Die Clashes.com
http://rotateddies.com - Rotated Die Coin Census
http://traildies.com - A SITE FOR LEARNING AND CATALOGING THE DIE ERROR KNOWN AS “TRAILS”
https://error-ref.com - The Error – Variety Ready Reference
https://minterrornews.com/index.html
GRADING
https://www.youtube.com/c/PCGScoin - PCGS Youtube Channel with Coin Grading Videos
https://www.pcgs.com/photograde/ - PCGS Photograde
https://www.money.org/official-grading-standards - ANA Official Coin Grading Standards
https://www.money.org/morgan-dollar-coin-grading - ANA Morgan Dollar Grading Set
http://www.coingrading.com - How To Grade US Coins by James Halperin (online book)
Hobos
http://hobonickels.org
Patterns
https://Uspatterns.com
https://uspatterns.stores.yahoo.net
SCD?
https://socalleddollar.com/
Slabs
https://sampleslabs.com/index.php
https://coinauctionshelp.com/page16.html
https://sampleslabs.com
Actual vs PMD / and Coin Production
http://conecaonline.org/wp-content/uploads/2017/10/StrikeDoublingFlyer-1.pdf
https://forums.collectors.com/discussion/1008645/error-vs-post-mint-damage
https://www.usmint.gov/learn/production-process/coin-production
https://www.usmint.gov/learn/production-process/die-making
Tokens - CWT, HTT, General
http://tokencatalog.com/index.php
http://hardtimestokens.com/HT261HT280.html
World
PCGS LINKS
https://www.pcgs.com/apps
https://www.pcgs.com/auctionprices - APR
https://www.pcgs.com/cert/
https://www.pcgs.com/coinfacts/
https://www.pcgs.com/coinfacts/stats
https://www.pcgs.com/grades/
https://www.pcgs.com/holdermuseum - slab generations
https://www.pcgs.com/news - new events, special coins, articles, etc
https://www.pcgs.com/news/pcgs-expands-variety-attribution-service
https://www.pcgs.com/photograde/
https://www.pcgs.com/pop
https://www.pcgs.com/prices
https://www.pcgs.com/setregistry
https://www.pcgs.com/Statistics - graded/crossed/counterfeits etc
https://www.pcgs.com/varietyfaq
NUMISMATIC WEBSITES
https://nnp.wustl.edu/ - Washington University Numismatic portal / Newman NP
https://nnp.wustl.edu/library/books - Digital library Washington University Numismatic portal
https://www.youtube.com/user/USMINT - United State Mint Youtube Channel
https://www.usmint.gov - United State Mint Website
https://numismatics.org - American Numismatic Society (ANS)
MISC NEED SORTED
https://coincommunity.com/forum/topic.asp?TOPIC_ID=341965 - RPM/OMM
https://forums.collectors.com/discussion/1008812/making-money-error-vs-pmd
https://forums.collectors.com/discussion/1016608/digital-deception-by-use-of-image-editing-software
https://forums.collectors.com/discussion/1021539/free-collection-of-digital-numismatic-books-us
https://forums.collectors.com/discussion/1075720/the-pcgs-counterfeiters-are-getting-too-good-watch-out
https://forums.collectors.com/discussion/1077119/1-1883-o-over-dip - A thread on over dipped coins.
https://forums.collectors.com/discussion/1077719/please-allow-me-to-introduce-myself-i-am-pvc-update-completed#latest
https://forums.collectors.com/discussion/1078159/some-new-members-may-enjoy-this-advice-from-1909-a-poor-coin-is-an-aggravation-and-an-eyesore#latest
https://www.coinnews.net/2014/01/06/how-the-denver-mint-makes-dies-to-produce-coins/
Historical forum lists
https://forums.collectors.com/discussion/607798/master-list-your-favorite-coin-websites-updated-8-28-2014/p1
https://forums.collectors.com/discussion/939652/master-list-redux-your-favorite-coin-websites-updated-october-1-2016/p1
COUNTERFEIT
A look at a counterfeit operation
http://ncna.club/wp-content/uploads/2019/05/Counterfeit-Coins-Article.pdf

https://www.money.org/uploads/Counterfeit Detection Vol.2.pdf
https://forums.collectors.com/discussion/1075720/the-pcgs-counterfeiters-are-getting-too-good-watch-out#latest
HOW COINS ARE MADE
https://www.usmint.gov/learn/production-process/coin-production
Washington University Numismatic portal
https://nnp.wustl.edu/
Digital library Washington University Numismatic portal 
https://nnp.wustl.edu/library/books
VIDEOS
For US Patterns
Uspatterns.com
colonial
https://coins.nd.edu/ColCoin/ColCoinContents/Introduction.html
pcgs grading videos
https://www.pcgs.com/education?utm_source=pcgs&utm_medium=spotlight&utm_campaign=education
FH & Bust Half varieties
http://maibockaddict.com
online book (old book) how to grade u.s. coins by James Halperin
http://www.coingrading.com
Error info
https://www.error-ref.com
https://minterrornews.com/index.html
PVC DAMAGE
https://forums.collectors.com/discussion/1077719/please-allow-me-to-introduce-myself-i-am-pvc-update-completed#latest
Coinfacts WIKI
https://www.coinfactswiki.com/wiki/Main_Page
Token info
http://tokencatalog.com/index.php
VAMs Morgan & peace $
http://www.vamworld.com/wiki/Home
4 minute video on minting of quarter
https://www.youtube.com/watch?v=HRpRz2P4l2g
Channel
https://www.youtube.com/user/USMINT
coinnews.net/2014/01/06/how-the-denver-mint-makes-dies-to-produce-coins/
usmint.gov/learn/production-process/die-making
Numismatic book dealers
https://abebooks.com/servlet/SearchResults?vci=53552&vcat=Numismatics&vcatn=Numismatics
https://numislit.com/
https://coinbooks.org/
https://forums.collectors.com/home/leaving?allowTrusted=1&target=https://brooklyngallery.com/coin-books.html
Counterfeit PCGS slab information
https://forums.collectors.com/discussion/1075720/the-pcgs-counterfeiters-are-getting-too-good-watch-out#latest
Counterfeit info
http://numismaticcrimes.org/
Counterfeit info
https://acefonline.org/
ADVICE for collectors from 1909
https://forums.collectors.com/discussion/1078159/some-new-members-may-enjoy-this-advice-from-1909-a-poor-coin-is-an-aggravation-and-an-eyesore#latest
NNP: American Half Cents: The "Little Half Sisters" (Second Edition) - Roger S. Cohen, Jr. (1982)
https://nnp.wustl.edu/library/book/555403.
NNP: The Cent Book: 1816-1839 - Wright, John D. (1992)
https://nnp.wustl.edu/library/book/530759

Updates:
Cent Book (1825 N-25 Insert) - Wright, John D. (2022)... https://nnp.wustl.edu/library/book/614807
Cent Book (1839 N-5, N-10 Insert) - Wright, John D. (2022)... https://nnp.wustl.edu/library/book/614808
Cent Book (Errata) - Wright, John D. (2022)... https://nnp.wustl.edu/library/book/614809
NNP: Die Varieties of United States Large Cents - Grellman, John Robert (2020)
https://nnp.wustl.edu/library/book/586931
.
.
NNP: The Complete Guide to Shield & Liberty Head Nickels - Gloria Peters, Cynthia Mohon (1995)
https://nnp.wustl.edu/library/book/555394
NNP: Buffalo Nickels: The Abraded Die Varieties - Pope, Ron (2006)
https://nnp.wustl.edu/library/book/526116
NNP: The Complete Guide to Buffalo Nickels - David W. Lange (1992)
https://nnp.wustl.edu/library/book/555290
.
.
NNP: The Complete Guide to Liberty Seated Half Dimes - Al Blythe (1992)
https://nnp.wustl.edu/library/book/555401
NNP: Liberty Seated Half Dime - Top 100 Varieties Set - Cummins, Clint (2020)
https://nnp.wustl.edu/library/book/581451
.
.
NNP: The Complete Guide to Liberty Seated Dimes - Brian Greer (1992)
https://nnp.wustl.edu/library/book/555400
NNP: The Complete Guide to Barber Dimes - David Lawrence (1991)
https://nnp.wustl.edu/library/book/555294
NNP: The Complete Guide to Mercury Dimes - David W. Lange (1993)
https://nnp.wustl.edu/library/book/555399
.
.
NNP: The Complete Guide to Barber Quarters, Second Edition - David Lawrence (1994)
https://nnp.wustl.edu/library/book/555291
NNP: The Complete Guide to Washington Quarters - John Feigenbaum (1994)
https://nnp.wustl.edu/library/book/555397
.
.
NNP: The Complete Guide to Liberty Seated Half Dollars - Randy Wiley, Bill Bugert (1993)
https://nnp.wustl.edu/library/book/555396
NNP: A Register of Liberty Seated Half Dollar Varieties, Volume I, San Francisco Branch Mint - Bugert, William B(arton) (2009)
https://nnp.wustl.edu/library/book/529686
NNP: A Register of Liberty Seated Half Dollar Varieties, Volume II, Carson City Branch Mint - Bugert, William B(arton) (2010)
https://nnp.wustl.edu/library/book/529687
NNP: A Register of Liberty Seated Half Dollars, Volume III, New Orleans Branch Mint 1840-O to 1853-O NA - Bugert, William B(arton) (2011)
https://nnp.wustl.edu/library/book/529688
NNP: A Register of Liberty Seated Half Dollar Varieties, Volume IV, New Orleans Branch Mint 1853-O WA to 1861-O - Bugert, William B(arton) (2013)
https://nnp.wustl.edu/library/book/529689
NNP: A Register of Liberty Seated Half Dollar Varieties, Volume V - Bugert, William B(arton) (2016)
https://nnp.wustl.edu/library/book/585798
NNP: The Complete Guide to Barber Halves - David Lawrence (1991)
https://nnp.wustl.edu/library/book/555292
NNP: The Complete Guide to Franklin Half Dollars: Updated Second Edition - Rick Tomaska (2002)
https://nnp.wustl.edu/library/book/555398
.
.
NNP: Silver Dollars & Trade Dollars of the United States: A Complete Encyclopedia Vol. 1 - Q. David Bowers (1993)
https://nnp.wustl.edu/library/book/601210
NNP: Silver Dollars & Trade Dollars of the United States: A Complete Encyclopedia Vol. 2 - Q. David Bowers (1993)
https://nnp.wustl.edu/library/book/601211
.
.
NNP: Type I Double Eagles, 1850-1866 - Douglas Winter, Adam Crum (2002)
https://nnp.wustl.edu/library/book/559680
NNP: Type Two Double Eagles 1866-1876, Second Edition - Douglas Winter, Michael Fuljenz (1999)
https://nnp.wustl.edu/library/book/559681
NNP: Gold Coins of the Carson City Mint - Douglas Winter (2001)
https://nnp.wustl.edu/library/book/559683
NNP: Gold Coins of the Dahlonega Mint 1838-1861, Second Edition - Douglas Winter (2003)
https://nnp.wustl.edu/library/book/559678
NNP: Gold Coins of the New Orleans Mint 1839-1909, Second Edition - Douglas Winter (2006)
https://nnp.wustl.edu/library/book/559677
NNP: Gold Coins of the Old West: The Carson City Mint 1870-1893 - Douglas Winter, Lawrence E. Cutler (1994)
https://nnp.wustl.edu/library/book/559675
A thread on over dipped coins. 
https://forums.collectors.com/discussion/1077119/1-1883-o-over-dip#latest