Panama in 1973. In this mated pair, coin #1 is a
1973 Panama Tenth Balboa die struck both sides by the Panama dies on a U.S. clad dime planchet. In 1974, also at the San Francisco Mint, two obverse Lincoln Cent dies, both dated
1974-S, were paired together and installed in the same press. If a copper cent planchet had been struck by this die pair, a two-headed Lincoln cent would have been produced. To date, none have been discovered. This 1973 Tenth Balboa was placed in the collar of the press containing the two obverse dies for the 1974-S Lincoln Cent, on top of a copper cent planchet already seated in the collar. These were then subsequently struck together (mated).
NGC Certifies First Sacagawea-Presidential Dollar Mule
Sacagawea Dollar and a
Presidential Dollar.
This incredible error, which paired a Sacagawea Dollar obverse with a Presidential Dollar reverse, was struck in 2014 at the
Denver Mint. It is now graded NGC Mint Error AU 58 with a notation of “Discovery Coin” to recognize its important place in numismatic history.
The Sacagawea Dollar series began in 2000 and is named after the Native American woman who appears on its obverse. The Presidential Dollar series began in 2007, using the same planchets as the Sacagawea series: 26.5 millimeters in diameter, 8.1 grams in weight and consisting of a copper core surrounded by manganese brass. The edge of this mule sheds some light on its history: It bears the year 2014 and the “D” mintmark of Denver.