FG stands for Frank Gasparro, the coin's designer.
I assume you have a small dollar coin with a picture of Susan B. Anthony on the front and an image of the Apollo Mission eagle on the back. This was a standard-issue coin at the time and is worth only face value, unless it's a Proof coin in its original holder.
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.
That's the monogram of Frank Gasparro, who designed the coin. His initials are also to the right of the Lincoln Memorial on the cent. All U.S. coins now carry their designers' monogram somewhere, but they can be difficult to find and even harder to interpret. They are also sometimes confused with mint marks, which mixes things up even more.
Those are the initials of Frank Gasparro, the US Mint engraver from the 1950s to the 1980s. He was responsible for the Lincoln Memorial reverse on the cent and the Eisenhower and Anthony dollar designs, among other coins.
The abbreviation of FG on a U.S. penny stands for the name of the man who designed the back part of the coin. His name was Frank Gasparro.
Frank Gasparro
FG are the initials for Frank Gasparro, who designed the Susan B. Anthony dollar.
It's still worth one dollar. The coin isn't made of silver (unless it's a collector or proof issue from San Francisco), but rather the same copper/nickel blend as quarters and dimes. The letters FG are the initials of Frank Gasparro, who designed the coin.
FG stands for Frank Gasparro, who designed the back of the Eisenhower dollar. The coin, in circulated condition, is still worth one dollar.
D is the mint mark (Denver), FG is the designer's monogram (Frank Gasparro)
7-31-11>>> Unfortunately only one of the of the Susan B. Anthony dollars made for general circulation is worth more than face value. The 1979 "P" Wide rim (near date) variety. Other than that, only Proof and collectors coins sold from the US Mint are worth more. None of the coins have been made from silver, if it's not one of the above types, just spend it. Note: The FG you see is the designers (Frank Gasparro) initials, all SBA coins have it.
From your description the coin is a common Susan B. Anthony dollar (1979-1981 & 1999) that is in circulation today. The FG is the designers monogram and adds nothing to the value of the coin. It's just a dollar coin, spend it.
FG is the monogram of the designer Frank Gasparro - it's not a mint mark. It's supposed to be on all JFK halves regardless of the date. The only way you could have a Kennedy half dollar without "FG" on the back would be if you had a common error called a "filled die" coin, and these aren't considered to be anything special.
FG is the monogram of Frank Gasparro, who designed the coin. The mint mark if any is above the date on the front. Please see the Related Question.
The FG stands for Frank Gasparro the designer of the reverse of the coin.
FG stands for the designer of this coin, Frank Gasparro.
No its not. The letters are the initials of Frank Gasparro who designed the coin. The only mint marks used today on dollar coins are P, S, and D.
The FG on the reverse is the monogram of Frank Gasparro, he designed the reverse of the coin