According to a thread in the RC forum, proof bicentennial half dollars can be 40% silver? Can anyone please elaborate on this because I am not familiar with the story here.
Yep, they are S mintmarks. Have found 2 of them in the past year.
Sold in 3-piece Bicentennial sets along with the Silver Clad Washington Quarters and Silver-Clad Eisenhower Dollars. Mintages are approximate - 11,000,000 sets were struck and sold until 1982, when sales were halted.
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