Guide · 4 min read · Updated
What Is a CasiOak? The GA-2100 Explained
Short answer
“CasiOak” is the fan nickname for the octagonal G-SHOCK GA-2100: a slim analog-digital watch, launched in 2019, whose eight-sided bezel recalls far pricier luxury sports watches. It is a community nickname, not an official Casio name.
Where the nickname comes from
When the GA-2100 launched, its octagonal bezel immediately drew comparisons with iconic luxury sports watches. The community combined the two ideas into “CasiOak”, and the name stuck.
GA-2100 vs. GM-2100 vs. CasiOak metal mods
All three share the silhouette. The difference is material and weight.
- GA-2100 — resin bezel, the lightest and most casual: 51 g and 11.8 mm thick.
- GM-2100 — a stainless steel bezel for extra shine: 72 g, same 11.8 mm thickness and module 5611.
- CasiOak metal builds — custom angular cases and bracelets for a full-metal look; heavier than either stock model.
How to choose your colorway
Start with how you dress. Monochrome black, white or silver goes with everything; rainbow, camo and animated dials are statement pieces. Many collectors keep one neutral and one loud GA-2100 in rotation.
Common questions
What model is the CasioAk?
The CasioAk is the G-SHOCK GA-2100. The nickname is also used for its relatives in the 2100 series, such as the solar GA-B2100 and the steel-bezel GM-2100.
How big is a CasioAk?
Casio lists the stock GA-2100 at 48.5 × 45.4 × 11.8 mm and 51 g, which is slim and light for a G-SHOCK.
Is the CasioAk solar or Bluetooth?
The GA-2100 is neither: it runs on batteries for about three years. The GA-B2100 adds Tough Solar charging and Bluetooth in the same shape.
Is CasioAk an official Casio name?
No. It is a fan nickname that joins “Casio” with the name of a famous octagonal luxury watch. Casio calls the watch the GA-2100, and it is not connected to any luxury brand.
What is a CasioAk mod?
A CasioAk mod changes the outside of a GA-2100: a metal or moissanite bezel, or a steel case and band kit. The movement stays the same.
Is the CasioAk related to the AP Royal Oak?
No. The CasioAk is a Casio G-SHOCK GA-2100. The nickname refers to the Audemars Piguet Royal Oak, a luxury watch with an octagonal bezel that it loosely resembles. They are unrelated watches from different makers.
When was the GA-2100 released?
Casio unveiled the GA-2100 in 2019. The solar, Bluetooth GA-B2100 and the steel-bezel GM-2100 followed in the same octagonal shape.
What is the CasioAk's real name?
Its real name is the G-SHOCK GA-2100. CasioAk is a nickname given by fans, not a name Casio uses.