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<p>[QUOTE="cladking, post: 188965, member: 68"]They didn't make proof or mint sets 1965-67. Instead they made the SMS's which are really neither fish nor fowl. They experimented with different processes so there are lots of different looks to these but most were effectively struck once under higher pressure by proof dies. They aren't true proofs because they were struck only once. </p><p><br /></p><p>Most mint set collectors always considered them proof sets and proof sets collectors thought of them as mint sets so they got little attention until recently. There are no positive ways to differentiate these strikes from regular circulation strikes but they can be told apart with great accuracy with experience. There are numerous complicating factors such as the production of all denominations in San Francisco during this period without mint marks. The SMS's were also struck here and retired SMS dies were sometimes used to strike coins for circulation. </p><p><br /></p><p>They have become much more popular in the last few years and their lower mintages and much higher attritions has resulted in significant price increases. Sets with frosted cameo coins are especially desirable.[/QUOTE]</p><p><br /></p>
[QUOTE="cladking, post: 188965, member: 68"]They didn't make proof or mint sets 1965-67. Instead they made the SMS's which are really neither fish nor fowl. They experimented with different processes so there are lots of different looks to these but most were effectively struck once under higher pressure by proof dies. They aren't true proofs because they were struck only once. Most mint set collectors always considered them proof sets and proof sets collectors thought of them as mint sets so they got little attention until recently. There are no positive ways to differentiate these strikes from regular circulation strikes but they can be told apart with great accuracy with experience. There are numerous complicating factors such as the production of all denominations in San Francisco during this period without mint marks. The SMS's were also struck here and retired SMS dies were sometimes used to strike coins for circulation. They have become much more popular in the last few years and their lower mintages and much higher attritions has resulted in significant price increases. Sets with frosted cameo coins are especially desirable.[/QUOTE]
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