What This Coin Looks Like (Obverse, Reverse, Mint Mark Location, Special Features, etc.): The 1918/7 S Standing Liberty Quarter had a major overdate error. The 1918 date was struck over and on top of an 1917 date. This resulted in a prominent error where the underlying "7" is seen clearly within the "8". An example image of this overdate error is depicted above.
Coin Value Chart: Typical Coin Prices, Values and Worth in USD based on Grade/Condition