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Message:: [QUOTE="KBBPLL, post: 25584368, member: 104064"]No, it was caused by the omission of the mint mark when preparing the dies for SF proof coins. Apparently they can tell that it's not just a grease-filled die. ""No-S" Proof coins were the product of the way in which Proof dies were handled. Beginning in 1968, when the San Francisco Mint began striking Proof coins, all dies for Proof coins were prepared at the Philadelphia Mint. This was done by adding a mintmark to a normal P-Mint die. However, some dies escaped this process, thus we see "No-S" dimes in 1968, 1970, 1975, and 1983, "No-S" Nickels in 1971, and "No-S" Lincoln Cents in 1990. Any estimates of the number of "No-S" coins is strictly a guess, but all except for the 1975 No-S Dime have certified populations of between 24 and 242."[/QUOTE]