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Casio 2100 Series 49.3mm X 44.4mm Mens Watch Pink
Ref. GBM-2100A-4BER
Sits in Casio’s upper tier here — more premium than three quarters of the Casio watches we list, which start at £25.
Price range £25 to £919 across 70 Casio watches in stock.The GBM-2100 sits within the CasiOak lineage, a family built around the idea that a G-Shock could wear the octagonal geometry of a luxury sports watch without abandoning what makes G-Shock useful. This particular model steps up from the entry resin GA-2100 by adding a polished stainless steel outer bezel over a bio-based resin inner shell — a layered construction that gives it a finish closer to a dress-adjacent sports watch than a tool watch, without compromising the 200m rating underneath. The vapour pink dial is produced through metallic vapour deposition, which means the colour carries a reflective, slightly metallic quality that shifts with the light rather than sitting flat. At 11.9mm it is genuinely slim for something rated this deep, slim enough to clear a shirt cuff, and at 72 grams light enough that the wrist forgets it is there. The solar cell manages roughly seven months of normal use on a full charge, extending to eighteen in power-saving mode, so the battery is effectively a non-issue in everyday wear. Bluetooth pairing keeps timekeeping exact, but the module holds to within fifteen seconds per month on its own — precise enough that the connection is convenient rather than necessary. The strap runs tool-free quick-release bars, so swapping it out is a thirty-second job.
- Reference
- GBM-2100A-4BER
- Brand
- Casio
- Collection
- G-ShockCase Size: 44
- Case size
- 49.3mm
- Case thickness
- 11.9mm
- Case material
- Stainless steel
- Case shape
- Octagonal
- Dial
- Pink
- Crystal
- Mineral
- Movement
- Solar
- Calibre
- 5729
- Functions
- Stopwatch, Countdown timer, Alarm, Backlight, World time, Solar powered, Bluetooth, Dual display, Digital display
- Water resistance
- 200m
- Bracelet / strap
- Rubber strap
- Strap colour
- Black
- Clasp
- Buckle
- Lume
- Luminous
- Retailer
- Goldsmiths
Additional specifications
- Lug-to-lug
- 49.3mm
- Strap
- Interchangeable
Learn more about Casio
Tadao Kashio founded Kashio Seisakujo in Tokyo in 1946 as a machine shop. The company's first success was a finger ring that held a cigarette, and its second was the 14-A of 1957 — the world's first all-electric compact calculator, which used solenoids rather than gears.
Casio entered watchmaking in 1974 with the Casiotron, a digital watch with an automatic calendar that knew the varying lengths of months. The company approached watches as an electronics manufacturer rather than a horological one, and that difference produced the G-Shock.
The G-Shock came from a single engineer, Kikuo Ibe, who broke a watch his father had given him and set out to build one that could not break. The specification was three tens: survive a ten-metre drop, ten bars of water pressure, and ten years of battery life. It took over two hundred prototypes, and the solution was suspending the module inside the case on a cushioned internal structure rather than mounting it rigidly. The DW-5000C shipped in 1983.
It became one of the most durable product designs in any category, adopted by militaries, emergency services, and skateboarders alike, and Casio has since added solar charging, radio and GPS timekeeping, Bluetooth, and full-metal and carbon variants.
Casio also produces the Edifice, Pro Trek, and Oceanus lines, and remains an independent Japanese public company.
- 1946
- Tadao Kashio founds the company in Tokyo.
- 1974
- The Casiotron is Casio's first digital watch.
- 1983
- The G-Shock DW-5000C survives Kikuo Ibe's three-tens brief.
- 1994
- The Frogman extends G-Shock to ISO dive certification.
This watch appears in Stainless Steel (2,298), 44mm and Over (732), Sports Watches (563), Dive Watches (379), Solar & Kinetic (103) and Divers Under £300 (65).
Manufacturer’s guarantee
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 200m it is rated for swimming, snorkelling and recreational diving.
Will the glass scratch?
It can, over time. Mineral glass handles daily wear but will pick up fine scratches that sapphire would not.
Does it need a battery?
No. It charges from light, and the cell behind that is designed to last a decade or more.
Will it fit my wrist?
Lug-to-lug is 49.3mm, which suits wrists from roughly 16.5cm (6½ inches) upward.
Lug-to-lug decides fit more than case diameter does.
Is it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Goldsmiths is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
Who are Goldsmiths?
Goldsmiths has been selling watches in Britain since 1778 and is part of the Watches of Switzerland Group, which is listed on the London Stock Exchange. They are an authorised dealer, so a watch comes with the manufacturer’s own warranty.
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