Designed by sculptor Adolph A. Weinman, the Mercury dime, also known as the Winged Liberty Head dime, was first minted in 1916 and remained in production until 1945. The 1921-D issue is especially rare, as it was struck in lower quantities compared to other years, making it a key date for collectors. Only about 1.2 million 1921-D dimes were minted, adding to its desirability.
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