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Casio MT-G-B3000 Series 52mm Mens Watch Black
Ref. MTG-B3000D-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 £799 across 128 Casio watches in stock.The MT-G line sits above standard G-Shock production as Casio's answer to a particular challenge: how to build a watch that meets the full Triple G Resist standard — shock, centrifugal force, sustained vibration — while wearing more like a dress watch than a field instrument. The MTG-B3000 solves this through a Dual Core Guard architecture in which a carbon-reinforced resin inner shell carries the module, and a stainless steel outer structure wraps around it. Crucially, the caseback is not a separate panel but a structural component machined upward into a three-dimensional form that simultaneously serves as the lug attachment, the crown guard and the button guards. That integration is what brings the height down to 12.1mm — genuinely slim for something built to this protection standard, and slim enough to clear a shirt cuff. At just over 50mm wide and 148 grams, this is not a small watch, and it does not pretend to be. The black dial and case read as a single dark mass at a glance, with the bracelet's silver tones providing the contrast. Timekeeping is handled automatically: Multi Band 6 atomic calibration pulls signals across Europe, North America, Japan and China, while Bluetooth keeps the watch synced to the CASIO WATCHES app when a signal is unavailable. The solar cell means the question of battery replacement simply does not arise.
- Reference
- MTG-B3000D-1AER
- Brand
- Casio
- Collection
- G-Shock
- Case size
- 51.9mm
- Case material
- Resin
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Movement
- Automatic
- Functions
- GMT, Stopwatch, Countdown timer, Backlight, Solar powered, Radio controlled, Bluetooth
- Water resistance
- 200m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- Retailer
- Goldsmiths
Additional specifications
- Weight
- 148g
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 (3,988), Automatic Watches (1,546), Watches 44mm and Over (753), Sports Watches (700), Dive Watches (494) and GMT Watches (212).
Temporarily out of stock
Goldsmiths is not currently taking orders for this reference. Last listed as available on 27 September 2026. Stock is checked nightly and this page updates when it returns.
What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 200m water resistance, rated for actual diving
- Sapphire crystal, which resists scratching
- Second time zone for travelling
- One of Casio's more premium watches
Worth knowing
- 51.9mm is a large watch with real presence
Casio MT-G-B3000 Series alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | MTG-B3000D-1AER | 010-03406-01 |
|---|---|---|
| Price | £919 | £1,219 |
| Case size | 51.9mm | 51mm |
| Water resistance | 200m | 100m |
| Movement | Automatic | Automatic |
| Strap | Stainless steel bracelet | Silicone strap |
| 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?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedIs it a men's or women's watch?
Listed as men's.
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