Only 3 Known: 1970-S Proof Quarter Mule Error Sells for $125,000
Yes — when it’s one of only three known examples in the world. A rare 1970-S Proof Washington Quarter recently stunned collectors after reaching six figures at auction. What makes it extraordinary isn’t just its age, but a dramatic minting mistake that slipped past strict quality control. Here’s why this coin has become one of … Read more