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
The mint mark on a Barber Half Dollar is located on the reverse side right under the tail of the eagle.
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 is on the reverse of the coin between the tail and the D in the word dollar.
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.
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.
The mint mark on Franklin half dollars is on the reverse side, just above the Liberty Bell.
Hammer and sickle
Mark Huish was born in 1808.
This would be a Liberty Seated half dollar. The mintmark, if it has one, would be locted on the back below the eagle.
Not being certain which half dollar you have, I can tell you that there was never an "A" or a "N" mint mark. The letters you should find will be a "D", an "S", an "O", a "P" or a "CC"