GM-2100 (CasiOak Metal Bezel)

The Casio GM-2100, dubbed the “CasiOak” for its octagonal bezel, reimagines the cult-favorite GA-2100 by introducing a stainless steel case and bezel. This upgrade delivers a more substantial wrist presence and a refined look, making it a standout in Casio’s G-Shock lineup. Its appeal lies in blending the lightweight comfort and durability of resin with the visual punch of polished metal, offering collectors a fresh take on a modern classic without venturing into luxury price territory.

Reference GM-2100 models differ mainly in colorways and strap options, with variants like the GM-2100-1A (black dial, resin strap) and GM-2100N-2A (blue ion-plated bezel) commanding different premiums based on finish and scarcity. Expect price variations driven by limited editions or exclusive regional releases, as well as the condition of the metal bezel, which can show wear more readily than resin.

Inside, the reliable Module 5611 quartz movement delivers world time, stopwatch, and a 200m water resistance rating, making the GM-2100 suitable for daily wear and adventure alike. When buying, check for original box and papers—especially for special editions—and inspect the bezel and crystal for scratches, as these affect value. The GM-2100’s growing popularity means some colors sell out quickly, so timing your purchase can be crucial for securing your preferred variant.