The concept colour is yellow, the hue featured on the very first FROGMAN, the DW-6300, and one of the colours that is symbolic of the line. The crown, buttons, and screws are treated with gold IP. Sapphire crystal is press-fit into the titanium screw-lock case back to ensure a highly airtight structure while maintaining the built-in antenna’s radio wave reception sensitivity. Casio passion for refinement down to the finest details is evident everywhere in the design, with gold vapour deposition, and engravings of the first-generation FROGMAN diving frog character, as well as the words “G-SHOCK 40TH” and “FROGMAN 30TH.”