Disclaimer: This is just a guide to give you an idea of what your coin might grade. Often coins will grade higher on one side vs. the other. In example, it's possible for a coin to grade G4 on its obverse, but grade VG8 on its reverse. Also, this guide is not a claim that one's coin will obtain any grade listed if submitted to a third party grading service.
2 Cent Shield Coin Photo Grading
Very Good (VG8)
Fine (F15)
Good (G4)
About Good (AG3)
Very Fine (VF35)
Extremely Fine (EF40)
Almost Uncirculated (AU55)
Almost Uncirculated (AU58)
Mint State (MS64 Red-Brown)
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When grading Two Cent Shield US Coins you should know that the WE in the motto is often struck weak and is the highest point of the coins design. You can often find weakness of the WE in the higher grades and this might take a point or two of the grade but is not always a determining factor between two different grades.

In example, it's possible to have two Two Cents graded VF but one will have most of the W "missing" or much weaker than the other. The same can be said for the horizontal lines in the shield since sometimes there will be weakness in this as well.
Two Cent Grading