The Counterfeit Coin Detector Patent Archive

Every device ever patented to catch a bad coin

Patented May 14, 1878

If an object in your hands says PAT. MAY 14, 1878, it may be one of these.

PatentTitleInventorOf
US 203,719IMPROVEMENT IN COUNTERFEIT-COIN DETECTER AND COIN-RECEIVER.Samuel A. FieldPhiladelphia, Pennsylvania

All dates