The mintmark (if any) is right above the bell and right under the E in "STATES" on the reverse.
If it was minted in San Francisco or Denver, there will be a small S or D above the yoke of the Liberty bell. Philadelphia did not use a P mint mark back then, so coins without a mint mark are from that city.
It's not a mint mark. The initials FG stand for Frank Gasparro, who designed the reverse of the coin. Gilroy Roberts designed the obverse.
Date, Mint mark and Motto
The mint mark is on the reverse (tails) side, just below the eagle and above the the words ONE DOL. If there is no mint mark, it means the coin was minted in Philadelphia.
The mint mark position on all Peace dollars is near the word ONE on the back. No mint mark = Philadelphia D = Denver S = San Francisco
The mint mark on Franklin half dollars is on the reverse side, just above the Liberty Bell.
No mint mark indicates that the coin was minted in Philadelphia.
If it has one, it's on the reverse above the bell.
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
If the coin shows any wear, value is for the silver at about $6.00
The mint mark on a Barber Half Dollar is located on the reverse side right under the tail of the eagle.
The mint mark is on the reverse of the coin between the tail and the D in the word dollar.
If it was minted in San Francisco or Denver, there will be a small S or D above the yoke of the Liberty bell. Philadelphia did not use a P mint mark back then, so coins without a mint mark are from that city.
Franklin halves are very obvious. They all have the same design, a picture of an older Benjamin Franklin on the front and the Liberty Bell on the back. The mint mark position is above the bell: No mint mark = Philadelphia D = Denver S = San Francisco
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.
At current silver prices, a '61 Franklin half is worth just under $10.
With no mint mark---very fine condition $3.00---uncirculated $16.00---proof $135.00 With D mint mark---very fine condition $3.00---uncirculated $12.00 With S mint mark---very fine condition $3.00---uncirculated $40.00