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I don't have it in front of me, But the Red Book Guide to Morgan Dollars by Q David Bowers touched upon some of this, I know that some dates were released from the treasury vaults in great numbers, some were nearly nonexistent, he mentioned that something huge like 85% of the mintage of one of the CC dates was in the basement of the treasury, and that until a few bags were found, one semi common New Orleans date used to be a huge rarity, comparable to the 93-S.
Philadelphia allegedly coined 12,000 Silver dollars in 1895, wouldn't be surprised if those 12 bags were in the wrong place at the wrong time and got melted.
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