It shouldn't be that hard for the 1966 and '67 sets. They were close to Proof coin status with better luster and a bit more detail. If you want to learn and develop "an eye" compare the sets in the mint holders with the business strike coins.
The 1965 sets are tougher. Some of them are decent and better than the business strikes, BUT a fair number of them were "pigs in cellophane." It's a matter of saying, "these coins look better and therefore are SMS." Others once they are cut of of the flat pack, it's game over.
Retired dealer and avid collector of U.S. type coins, 19th century presidential campaign medalets and selected medals. In recent years I have been working on a set of British coins - at least one coin from each king or queen who issued pieces that are collectible. I am also collecting at least one coin for each Roman emperor from Julius Caesar to ... ?
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The 1965 sets are tougher. Some of them are decent and better than the business strikes, BUT a fair number of them were "pigs in cellophane." It's a matter of saying, "these coins look better and therefore are SMS." Others once they are cut of of the flat pack, it's game over.
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-Paul