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Casio Master Of G-Air GravityMaster 56.5mm Mens Watch Black
Ref. GWR-B3000B-8AER
Sits in Casio’s upper tier here — more premium than three quarters of the Casio watches we list, which start at £20.
Price range £20 to £919 across 152 Casio watches in stock.The GravityMaster line has always been built around the demands of the cockpit — vibration, centrifugal force, the magnetic interference that aviation electronics generate constantly. This iteration advances that brief with TOUGH MVT.2, a movement new enough to detect magnetic field disturbance automatically and correct hand misalignment before the pilot notices it. The dual hollow case structure, where a carbon-reinforced inner case floats within an outer frame on resin dampers, exists for the same reason: to absorb what the cockpit throws at the movement rather than transmitting it directly. What that architecture produces on the wrist is a watch that reads larger than it feels. At 102 grams it sits with less mass than the visual bulk suggests, and 14.1mm across the case is surprisingly manageable for something rated to this depth and built to this standard of impact resistance. The matte black dial uses a microfabricated texture that cuts glare without killing contrast, and the integrated solar panels sit within it without fragmenting the layout. Five months of reserve means the watch continues functioning through any realistic stretch of low-light conditions, and global time synchronisation via Bluetooth removes the manual correction that aviation schedules make inconvenient.
- Reference
- GWR-B3000B-8AER
- Brand
- Casio
- Collection
- Master of G
- Case size
- 56.5mm
- Case thickness
- 14.1mm
- Case material
- Resin
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Movement
- Solar
- Calibre
- 5756
- Functions
- Chronograph, Date
- Water resistance
- 200m
- Bracelet / strap
- Rubber strap
- Strap colour
- Grey
- Clasp
- Buckle
- Lume
- Luminous
- Retailer
- Goldsmiths
Additional specifications
- Lug-to-lug
- 56.7mm
- Weight
- 102g
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 6 collections
This watch appears in Back in Stock (4,868), Chronograph Watches (1,199), Watches 44mm and Over (802), Sports Watches (800), Dive Watches (572) and Solar & Kinetic Watches (209).
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
- 56.7mm lug-to-lug keeps the 56.5mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- One of Casio's more premium watches
Worth knowing
- 56.5mm is a large watch with real presence
- 14.1mm thick, so it will not disappear under a cuff
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 charges from light, and the cell behind that is designed to last a decade or more.
Quartz, automatic and solar comparedWill it fit my wrist?
Lug-to-lug is 56.7mm, which suits wrists from roughly 18.5cm (7¼ inches) upward.
Lug-to-lug decides fit more than case diameter does.
How to size a watch to your wristIs 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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