Proof Lincoln Cents
1990 1C No S, FS-101, PR69 Red Ultra Cameo NGC. Although No S proof dimes are known from several years, the equivalent mint blunder for the cent denomination only occurred in 1990. A mint worker forgot to add the S mintmark to a proof cent die, and somehow the mistake went unnoticed until a few hundred sets had been distributed to fortunate collectors. The present fully struck specimen is free from contact, and the pumpkin-gold surfaces are nearly as made.