to the CCF, 420570! Pictures would greatly assist in diagnosing your coins. But briefly, the proof coin will have a bright mirror-like finish in the fields, while the mattes do not. The following two Numista pages show the differences between proof and matte for the 10 Dollar coin. Also, it seems that the mattes were used in the Uncirculated Specimen Sets, not the Proof Sets. 10 Dollars Sir Henry Morgan; silver proof 10 Dollars Sir Henry Morgan; matte (copper-nickel)
Inordinately fascinated by bits of metal with strange markings and figures
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