This would be a good subject to explore for a Numismatist article, or for an
ANA exhibit "The Coins of 1938" or something similar.
1938 was a low or no mintage date for many Denver coins -- 1938-D is a semi-key date in
Jefferson nickels, has two interesting varieties of
Buffalo nickel (D/D and D/S), a low mintage date for
Walking Liberty half dollars, a non-existent date for
Washington quarters, a scarcer date for Wheat cents, and a slightly scarcer
Mercury dime date (5.5m minted.)
There were commemorative silver issues minted in 1938 (Texas, etc.) but they were low mintage as well.
I do not know if anyone has ever investigated the reasons behind the Denver mint's low output in 1938; it's a subject worth exploring.
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