The GW-5525A is the tribute
model of the DW-5500 G-Shock II, nicknamed "Mudman", which was released
in August 1985 and is one of the most sought after vintage G-Shock among
vintage G-Shock collectors. It was the first G-Shock with a Mud Resist
structure. The actual buttons are covered by a flexible membrane, that
keeps mud and dirt out.