Side note; The company I worked for was a leader in many areas of metallurgy. The Treasury had them develop the alloys and the process for welding them together to make the sandwich coins that became the U.S. fiat money to replace silver coins.
Somehow, I doubt that these replacement coins will ever be truly collectible--although a lady who worked for me saved a safety deposit box full of the state quarters! She should have put the money into stocks.
Larry
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Larry W. Williams
RKCC #CM-041
ABKA #046
RKS #1246