On Susan B. Anthony dollars, the mint mark is on the front side, on the left, just above Anthony's right shoulder.
The 1979 SBA dollar coin is still in circulation today, value is one dollar.
Prior to 1979/80, coins struck at Philadelphia didn't carry mint marks*, so your nickel comes from that mint. Please see the Related Question for value information. (*) So-called "war nickels" bore the P mint mark from 1942 to 1945. The first coin to regularly carry a P was the 1979 SBA dollar. The next year, all other denominations except the cent were also given P mint marks.
The coin is a 1979 SBA dollar and it's NOT silver. The coin is still found in circulation and is just a dollar.
By the date 1979 your coin is a Susan B. Anthony dollar and none of the SBA Dollar coins struck for general circulation have more than face value and none have any silver. Only proof and uncirculated collectors coins sold from the Mint have premiums.
1979 would make it a Susan B. Anthony dollar. Lady Liberty hasn't been on a dollar coin since 1935. The '79 SBA dollar is worth face value only.
No known errors of mint marks on the SBA Dollars, if it looks odd take it to a collector or dealer an show it to them.
The same place as the mint mark on all other SBA dollars - on the left side of the coin near the collar on Anthony's blouse.
The 1979 SBA dollar coin is still in circulation today, value is one dollar.
Prior to 1979/80, coins struck at Philadelphia didn't carry mint marks*, so your nickel comes from that mint. Please see the Related Question for value information. (*) So-called "war nickels" bore the P mint mark from 1942 to 1945. The first coin to regularly carry a P was the 1979 SBA dollar. The next year, all other denominations except the cent were also given P mint marks.
The coin is a 1979 SBA dollar and it's NOT silver. The coin is still found in circulation and is just a dollar.
1979 was the first year of issue for the SBA dollar.
All SBA dollars should have a mint mark above the point of her collar, on the coin's left side. They were struck at all 3 mints so you could see a P, D, or S.
It's still worth one dollar.
In the grade of MS-60, the P & D mint coins are $1.27 the S mint are $1.38
By the date 1979 your coin is a Susan B. Anthony dollar and none of the SBA Dollar coins struck for general circulation have more than face value and none have any silver. Only proof and uncirculated collectors coins sold from the Mint have premiums.
Fortunately the initials "SBA" are enough to identify your coin as a Susan B. Anthony dollar. "FG" is not a mint mark - it's the monogram of the designer, Frank Gasparro. Please see the Related Question for more information.
None of the SBA Dollar coins struck for general circulation (except the 1979-P Near Date) have more than face value. Only proof and uncirculated collectors coins sold from the Mint have premiums.