New Casio G-Shock x Charles Darwin Foundation watches leak with animal themes

Two new collaboration watches appear at retailer

Casio appears to be preparing two new G-Shock watches made with the Charles Darwin Foundation, according to Notebookcheck. The foundation is a science and conservation organisation that carries out research in the Galapagos Islands. Casio has worked with it four times before, with the 2025 releases being the GAB2100DF-1A and the GAB2100DF-4A.

The new models showed up in the online store of Thai retailer Hatyai Nalika. The listed model numbers are the GA-B2100CDF-2A and the GW-B5600CDF-4. As with earlier watches in this collaboration, each design is themed on an animal found in the Galapagos.

Mini bird on the dial and a coral flamingo model

Leaked images shared by Instagram account Geesgshock indicate that the GA-B2100CDF-2A features a miniature image of a bird on its indicator dial, similar to the older GA-B2100DF-1A. Notebookcheck reports that the watch's blue and beige colour scheme suggests it may be inspired by the blue-footed booby, though this remains speculation.

The GW-B5600CDF-4 appears to have a flamingo theme. Images show a bright coral resin bezel and band, a red accent strap loop and a camouflage-style frame around the display.

When the watches may arrive

Casio has not officially announced either watch. Notebookcheck reports that an announcement is expected in December 2026. Based on how previous models in this series were released, the two watches could then roll out globally in early 2026. These timelines are unconfirmed and readers should wait for Casio's official statement for firm dates.

Why the collaboration matters

The Charles Darwin Foundation partnership has become a regular line for G-Shock, with each release raising the profile of Galapagos wildlife through animal-based designs. The watches themselves sit in familiar ranges: the GA-B2100 is an analogue-digital hybrid, while the GW-B5600 is a classic digital model.

For collectors, the recurring theme and limited scope of these collaborations have made earlier editions sought after. The addition of a miniature animal on the dial continues a design feature that distinguished the previous analogue model.