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Casio Full Metal 2100 Chrono 51.5mm Mens Watch Black
Ref. GMC-B2100D-1AER
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 135 Casio watches in stock.The octagonal bezel — a shape rooted in G-SHOCK's original 1983 design — defines the silhouette here, reinterpreted entirely in stainless steel with a black finish. The bezel itself receives a circular hairline treatment on its flat upper surface and a mirror polish along the angled edges, the two finishes working against each other to give the case depth. At 51.3 mm lug-to-lug and 46.3 mm wide, it wears with some presence, though the 12.4 mm thickness keeps it relatively trim. The all-analogue black dial carries three chronograph sub-dials arranged at 6, 9, and 12 o'clock, alongside a day-date window. Neobrite luminous coating covers the hands and markers. Power comes from Casio's Tough Solar system, with Bluetooth pairing handling world time across roughly 300 cities. The solid stainless steel bracelet, also finished in black, fastens with a one-touch three-fold clasp. Water resistance stands at 200 metres.
- Reference
- GMC-B2100D-1AER
- Brand
- Casio
- Collection
- G-Shock
- Case size
- 51.5mm
- Case thickness
- 12.4mm
- Case material
- Stainless steel
- Dial
- Black
- Crystal
- Mineral
- Movement
- Solar
- Calibre
- 5733
- Functions
- Chronograph, GMT, Date, Stopwatch, Countdown timer, Backlight, World time, Solar powered, Bluetooth
- Water resistance
- 200m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- Lume
- Luminous
- Retailer
- Goldsmiths
Additional specifications
- Weight
- 165g
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.
Also in 7 collections
This watch appears in the Casio G-Shock range (85), Back in Stock (2,812), Stainless Steel Watches (2,706), Chronograph Watches (1,029), Watches 44mm and Over (711), Sports Watches (698) and Dive Watches (491).
Manufacturer’s guarantee
What the specifications mean
A watch built to be worn hard and got wet.
Strengths
- 200m water resistance, rated for actual diving
- Luminous hands and markers for low light
- Second time zone for travelling
- One of Casio's more premium watches
Worth knowing
- 51.5mm is a large watch with real presence
Casio Full Metal 2100 Chrono alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | GMC-B2100D-1AER | 010-02907-11 | SFJ003P1 |
|---|---|---|---|
| Price | £739 | £859 | £469 |
| Case size | 51.5mm | 51mm | 48.3mm |
| Water resistance | 200m | 100m | 100m |
| Movement | Solar | Solar | Solar |
| Strap | Stainless steel bracelet | Silicone strap | Stainless steel bracelet |
| This watch |
|
|
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.
Water resistance explainedWill the glass scratch?
It can, over time. Mineral glass handles daily wear but will pick up fine scratches that sapphire would not.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It charges from light, and the cell behind that is designed to last a decade or more.
Quartz, automatic and solar comparedIs 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.
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