This is a very cool old belt buckle meant for a cloth belt. It is marked on the back Nickel Silver pat 12-19-21 Giant Grip Base Metal. It has pearlized lucite with red and green rhinestones with hand painted accents and the letter F with clear rhinestones.
It measures 1 and 3/4 inches by 1 and 1/2 inch.
It is in great functioning condition. One red rhinestone is darker that the other. Clear rhinestones look brighter in person. It needs a cleaning.