1968-D Washington Quarter Value in mint state is worth .25C to .50C if they’re circulated (worn) and will be worth $1 or more if they grade MS63. A 1968-D Washington Quarter can be worth $150 if graded and certified MS67 in a PCGS or NGC holder. A raw or ungraded uncirculated example will sell for less.
Mint Mark: Is either D (Denver Mint), No Mint (Philadelphia Mint), S (San Francisco Mint). The P mint mark was added to the coin in 1980 until the present but not present on a coin dated earlier than 1980.
The mint mark is located on the back and just above the R in QUARTER from 1932 to 1964, and 1965 to 1967 no mint mark was on the coins. Beginning in 1968 the mint mark was moved to the front of the coin and just behind Washington’s hair tie.