James Bond (Roger Moore) wears a Gucci belt in the last scenes of the movie The Man With The Golden Gun (1974).
The scene starts with the duel between Francisco Scaramanga (Christopher Lee) and Bond. The belt is worn with a white shirt with turnback cuffs and black pants. The belt and buckle can best be seen when Nick Nack shows Bond the entrance to Scaramanga's lair, and later throughout the deadly hide and seek game, and a few times when Bond tries to retrieve the Solex Agitator.
The Gucci belt buckle consists of a gold oval, with two stylized G's. The G's are not black but a very dark brown. Two G's, in different shapes and designs, are usually part of the Gucci logo. Interestingly, the golden G's are also an appropriate abbreviation for "Golden Gun" and the golden belt would have been very fitting for Scaramanga as well, but he wears another special golden belt that can hold two bullets.
The belt buckle pictured here came without the belt, but I will have one made, follow the progress on the Forum.