It means it was minted in Philadelphia. Remember, most Philadelphia coins didn't have mint marks prior to 1980.
If you mean a 1998 Kennedy half dollar, the coin has no silver in it and is worth face value.
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. The only mintmark a 1964 Kennedy half can have is a "D." It's to the left of the olive branch in the eagles claw.
(Florida) F and ( Georgia ) G
If you mean a 1971-D half dollar, it's just 50 cents.
His name was John Fitzgerald Kennedy, and the marking on the half dollar is the designer's initials.
There's no such coin as a half quarter. If you mean the quarter, it shows George Washington. If you mean the half dollar, it's John F. Kennedy.
It's the monogram of Frank Gasparro, who designed the coin.
The design is an adaptation of the Presidential Seal, and was used for the reverse design in honor of Kennedy's service as president.
No Kennedy half dollars dated 1982 are silver, those are 50 cents. But if you mean a 1982 George Washington commemorative half dollar, this coin is about $14.00.
Please be more specific about the "Knot" and post new question.
Or it’s just y2 or j2....
You most likely mean a kennedy half dollar with the date 1776-1976, such coins are common and unless in mint packaging are only worth 50 cents.