3 different Commemorative half's and 1 Walking Liberty half ( one from each mint ) were coined that year and all are dated 1921. Which one are you asking about? Post new question.
There are no U.S. notes with the series date of 1921
twenty one dollars
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50$
A US half dollar with a date of 1979 is a Kennedy half dollar not a liberty half dollar. The coin has no silver and is only face value.
It has a metal value of about $10.
Value is for the silver about $2.50
About $4-5
50 cents.
a half dollar
The US didn't strike any half dollars in 1804.
The New Orleans Mint closed in 1909 so there can't be a 1920-O half dollar. You may be seeing a "D" mint mark, in which case the coin should be examined by a professional dealer or appraiser. As of 04/2012 a 1921-D walking Liberty half retails for anywhere between $250 and $40,000 depending on its condition.