1971-S Proof Ike Dollar Overstruck on a Bronze San Francisco Assay Office Medal (17.1g)
NGC PF 69 RED CAMEO
This unique and amazing 1971-S Proof Eisenhower Dollar was overstruck on a 17.1g bronze San Francisco Assay Office Medal. Although there are three known Eisenhower Dollars struck on bronze planchets (two in mint state, one in proof) this is the only one known that was overstruck on a struck bronze medal.
Although the San Francisco Assay Office Medal weighs 17.1 grams and has a smaller diameter than an Eisenhower Dollar, the pressure of the strike from the proof dies expanded the diameter to the size of an Eisenhower Dollar. It is in superb gem proof red condition and shows considerable detail from the design of the understrike. An absolutely phenomenal and world-class major mint error!