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If you've been eyeing ten coin proof sets from 1999, beware that these sets are not from the US Mint. Ten coin proof sets have shown up in the marketplace containing a 1999 Proof Anthony Dollar. However, these are sets made from private individuals who are combining a genuine 1999 Proof coin into a 10 coin holder from later sets. There were never any ten coin proof sets offered from the US Mint during the 1999 year. However, a ten coin proof set was introduced in 2000. The genuine 1999 sets contain coins with an “S” Mint Mark from the San Francisco Mint.