Grand Theft Auto V logo deciphered

Eagle-eyed fan on Reddit, called eldunco, discovered that both the Roman numeral and lettering is almost identical to a special $5 bank note issued in 1889 by the U.S. Mint. It was the first bank note ever to feature a Native American, but caused controversy because they got his headdress wrong and used one from a completely different tribe.

As you can see the similarity is uncanny, but what exactly this means for the game is still open to interpretation. An American setting does now seem definite, although there's nothing stopping it having multiple cities (like San Andreas) - some perhaps even in other countries.