09/15/2026
How does an 1898 gold coin end up in a San Francisco proof press 72 years later?
This 1970-S Washington Quarter was struck on a gold planchet, weighing 8.3 grams—right around the weight of an 1898 $5 Liberty Head. Talk about a Mint Error Monday.
Proof coin errors are rare due to the amount of quality checking they endure, making this piece exceptional. It just sold for $120,937 at GreatCollections Coin Auctions.