technically, can I use an old proof set for my type set?
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IE. I have several old 1956 proof sets because it was my birth year. Can those be used in my 20th century type set? Or should they be business strikes? Just curious.
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One of the reasons I got out of the Registry Set Rat Race was that I had rare high grade high priced Mint State coins and other collectors were outranking me with their sleazy $30 Teletrade Pr. 69 DCams.
However PCGS now provides both MS & Prf and mixed sets catagories.