The Frogman is a high-end model of the Casio G-Shock line of watches. It was one of the first models of the "Master of G" line, a line of G-Shock watches designed for special uses. The Frogman has an asymmetric shape and is attached eccentrically on its straps. It is specially made as a diving watch for scuba divers and is the only ISO 6425-compliant G-Shock line with a 200 m Divers rating.
The first Frogman model (DW-6300) was released in November 1993. While Casio started to use a newer, four-screw back plate for its watches around that time, the DW-6300 retained the older screw-on back plate design. In June 1995, a second generation of the Frogman model was introduced, the DW-8200. From then on the Frogman became very popular among G-Shock collectors and many special editions were started to be introduced.