Casio introduced the GLX-5600 series in May 2008 as part of its G-Lide action sports lineup specifically tailored for the surfing community. The reference adapts the square form factor originating from the 1983 DW-5000C, utilizing a compact resin case measuring 43.2mm in width. Engineered for marine utility, the upper segment of the digital display houses a dedicated tide graph and moon phase indicator driven by module 3151.
G-Shock, a division of Casio, effectively created the "tough watch" category upon its debut in 1983. The brand was born from engineer Kikuo Ibe's "Triple 10" concept: a watch capable of surviving a 10-meter fall, with 10-bar (100m) water resistance, and a 10-year battery life. This was achieved through a revolutionary hollow case structure where the timekeeping module "floats" within a protective urethane bezel, isolating it from external shock.
While initially a purely utilitarian instrument, G-Shock's absolute durability made it a foundational tool for military and sports use. It has since evolved into a global cultural phenomenon, embraced by streetwear, fashion, and art, with its myriad collaborations and iterations making it a distinct and accessible collecting category.
Overall Grade: 7 / 10 | Good Condition, Heavy Visible Wear Production: Undated Contents: Box and Papers Genre: Sports Watch
Size: approx. 46.7mm Thickness: approx. 13mm Lug Width: Integrated
Case: Black resin square structure, matte finish, heavy wear Bezel: Black resin, matte finish with grey lettering, heavy wear Dial: Digital display, dedicated tide graph and moon phase zones Hands: ---
Crown: Four integrated stainless steel push buttons, heavy wear Crystal: Mineral crystal, heavy wear Bracelet: Black resin strap, heavy wear Caseback: Stainless steel, screwed-on, heavy wear Movement: Quartz Caliber: Module 3151