The 1920 Half Dollar - aka - Liberty Walking - mint mark of "D" or "S" would be located on the reverse side, just to the left and above the "H" in half dollar.
The mint mark on a Barber Half Dollar is located on the reverse side right under the tail of the eagle.
The mint mark on a 1936 Walking Liberty half dollar is located on the reverse [tails] side of the coin in the little "valley" just to the left of the word "HALF" near the edge of the rim.
above the DO in the dollar
On this coin, the mint mark is located in between the two middle numbers of the date, and slightly above. If there is no mark in this location, the coin was minted a Philadelphia.
It depends on the condition and the mint mark.The 1920 Standing Liberty Half Dollar minted in Philadelphia (no mint mark) is worth between $7.00 in "Good" condition (note that "Good" is a numismatic term of art meaning "not very good at all") to $75.00 in "Extremely Fine" condition (and $350.00 in "Uncirculated").The 1920 Standing Liberty Half Dollar minted in Denver ("D" mint mark) is worth between $12.00 in "Good" condition to $475.00 in "Extremely Fine" condition (and $1,550.00 in "Uncirculated").The 1920 Standing Liberty Half Dollar minted in San Francisco ("S" mint mark) is worth between $7.00 in "Good" condition to $235.00 in "Extremely Fine" condition (and $850.00 in "Uncirculated").The coin is 90% silver, has 0.3617 troy oz ASW ("Actual Silver Weight") and thus has a "melt value" (at the 11/29/07 troy ounce price of silver of $14.30) of about $5.17.The coin is a WALKING LIBERTY half dollar, the standing liberty series are Quarters.
The U.S. didn't mint any silver dollars in 1920.
The mint mark on a Barber Half Dollar is located on the reverse side right under the tail of the eagle.
The mint mark on a 1936 Walking Liberty half dollar is located on the reverse [tails] side of the coin in the little "valley" just to the left of the word "HALF" near the edge of the rim.
above the DO in the dollar
The first Half dollar with any mint mark was from the New Orleans Mint in 1838.The mint mark is on the reverse under the eagle
On this coin, the mint mark is located in between the two middle numbers of the date, and slightly above. If there is no mark in this location, the coin was minted a Philadelphia.
The mint mark is on the reverse of the coin between the tail and the D in the word dollar.
It depends on the condition and the mint mark.The 1920 Standing Liberty Half Dollar minted in Philadelphia (no mint mark) is worth between $7.00 in "Good" condition (note that "Good" is a numismatic term of art meaning "not very good at all") to $75.00 in "Extremely Fine" condition (and $350.00 in "Uncirculated").The 1920 Standing Liberty Half Dollar minted in Denver ("D" mint mark) is worth between $12.00 in "Good" condition to $475.00 in "Extremely Fine" condition (and $1,550.00 in "Uncirculated").The 1920 Standing Liberty Half Dollar minted in San Francisco ("S" mint mark) is worth between $7.00 in "Good" condition to $235.00 in "Extremely Fine" condition (and $850.00 in "Uncirculated").The coin is 90% silver, has 0.3617 troy oz ASW ("Actual Silver Weight") and thus has a "melt value" (at the 11/29/07 troy ounce price of silver of $14.30) of about $5.17.The coin is a WALKING LIBERTY half dollar, the standing liberty series are Quarters.
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.
An uncirculated Philadelphia half from 1972 retails for about $1.
No mint mark indicates that the coin was minted in Philadelphia.
Half a dollar Depends on the mint mark - if it has an "S" and is in its original packaging it might sell for a couple of dollars.