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New Casio G-Shock GMC-B2100Y-1AER chronograph revealed with resin-metal band and full stainless steel case

The Casio G-Shock GMC-B2100Y-1AER (pictured) has the familiar 2100-series metal shape and construction. (Image source: Impress Watch)
The new Casio G-Shock GMC-B2100Y-1AER (pictured) has the familiar 2100-series metal shape and construction. (Image source: Impress Watch)
Casio’s brand-new GMC-B2100Y-1AER chronograph combines a full stainless-steel case with a new resin-metal hybrid strap. The watch reportedly launches in August, and supports Bluetooth and solar charging.

A new Casio G-Shock chronograph with a brushed metal case and a fresh strap concept has quietly showed up on both Japanese blog Impress Watch and French website David et Philly. It’s called the GMC-B2100Y-1AER, and while it sticks to the familiar 2100-series shape, there are some design changes that demand attention.

The standout feature here is the new band. It is a double-layered strap that wraps soft silicone in a hard urethane shell. The top of the band is finished to look metallic, complete with brushing and gunmetal plating, while the inside keeps things soft and wearable. From a distance, it should almost pass for a full metal bracelet, but up close, the split-material build should become obvious.

(Image source: David et Philly - Edited)
(Image source: David et Philly - Edited)

The watch still carries the standard G-Shock features that need no introduction: 20-bar water resistance, shock resistance, and a stainless steel build around the octagonal bezel. Core functionality includes Bluetooth syncing, world time, alarms, LED light, and solar-powered quartz movement. The chronograph sub-dials fit neatly in the face, which helps keep the visual clutter low.

Weight is 108g, and the case measures 51.3 × 46.3 × 12.4 mm. It’s priced at €749 (~$875) on David et Philly and ¥99,000 (~$670) in Japan, with shipping dates set for September 30 and August respectively, depending on the region. However, the watches should get official listings earlier than the aforementioned dates. Also, the price disparity likely comes down to regional taxes, import duties, and retailer markups - Japan’s domestic pricing tends to be lower since Casio manufactures locally, while European retailers often apply higher margins.

From the way it wears and looks in the hands-on shots, the GMC-B2100Y-1AER should be great for users who like the idea of metal G-Shocks but prefer a more flexible strap - or just want something lighter on the wrist without giving up the full-metal aesthetic.

Buy the Casio G-Shock GST-B100D-1ACR on Amazon.

(Image source: David et Philly)
(Image source: David et Philly)
(Image source: David et Philly)
(Image source: David et Philly)

Source(s)

David et Philly (machine translated from French), Impress Watch (machine translated from Japanese)

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> Expert Reviews and News on Laptops, Smartphones and Tech Innovations > News > News Archive > Newsarchive 2025 07 > New Casio G-Shock GMC-B2100Y-1AER chronograph with resin-metal band and full stainless steel case revealed
Anubhav Sharma, 2025-07-15 (Update: 2025-07-15)