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Casio Master Of G-Air GravityMaster 56.5mm Mens Watch Black
Ref. GWR-B3000-1AER
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 aviation, but the GWR-B3000 pushes that brief further than any of its predecessors. The case architecture is the story: rather than a single shell, the carbon-reinforced inner module is suspended inside the stainless steel outer frame at four points, isolating the movement from the cockpit forces — shock, sustained vibration, centrifugal pull — that defeat conventional construction. The module 5756 at its centre takes that logic further still, detecting magnetic interference and sudden impacts and automatically correcting hand position when either threatens accuracy. That is a genuinely unusual capability, and one that matters when the watch is worn rather than displayed. At 47.3mm across and 56.7mm lug to lug it is a large watch, but 102 grams on the wrist is lighter than that footprint suggests, and 14.1mm of thickness is trim enough that the rubber strap pulls it closer to the arm than older Master of G references managed. The dial texture is engineered to cut glare rather than create it, which keeps the layout readable in direct sunlight without the face becoming a mirror. Pairing to the Casio app via Bluetooth opens a flight log alongside the atomic time sync, which is either irrelevant or exactly what the buyer is looking for.
- Reference
- GWR-B3000-1AER
- Brand
- Casio
- Collection
- G-Shock Master of G Gravitymaster
- Case size
- 56.5mm
- Case thickness
- 14.1mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Movement
- Solar
- Calibre
- 5756
- Functions
- Chronograph, Date
- Water resistance
- 200m
- Bracelet / strap
- Rubber strap
- Strap colour
- Black
- 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), Stainless Steel Watches (3,133), Chronograph Watches (1,199), Watches 44mm and Over (802), Sports Watches (800) and Dive Watches (572).
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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