The US made 2 varieties of $20 coins.
D = Denver
S = San Francisco
CC = Carson City
O = New Orleans
D = Denver
S = San Francisco
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mint mark is to the left of the value on the reverse.
On the reverse just to the left of the arrows
The mint mark for the 1909 Half Eagle is located on the reverse {eagle} side of the coin just to the left of the arrow points.
Assuming the coin is circulated and no mint mark retail values are $312.00-$420.00
From about $1300 to $75,000 depending upon the mint mark and the condition of the coin.