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Casio Analog Digital GA-100B Series Mens Watch
Ref. GAW-100B-1AER
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At 55.1 mm tall, 52.5 mm wide and 16.7 mm thick, this G-Shock sits large on the wrist. The black resin case is built around Casio's hollow core shock-resistant structure, with a knurled bezel combining stainless steel and resin. Beneath a mineral crystal, the dial runs a hybrid layout: analogue hands sit above three negative LCD subdials, and a hand-shift mechanism clears the hands aside when the digital windows need reading. The Super Illuminator LED backlight activates automatically on wrist tilt. Tough Solar charging powers Calibre 5444, which synchronises via Multi-Band 6 radio signals across Europe, the US, Japan, and China. Functions include world time across 48 cities and 31 time zones, a 1/100-second stopwatch to 60 minutes, a 100-minute countdown timer, five daily alarms, and a power reserve indicator. Water resistance is rated to 200 metres. The watch weighs 72 grams.
- Reference
- GAW-100B-1AER
- Brand
- Casio
- Collection
- G-Shock
- Case size
- 55.1mm
- Case thickness
- 16.7mm
- Case material
- Resin
- Case shape
- Round
- Dial
- Black
- Crystal
- Mineral
- Movement
- Automatic
- Calibre
- 5444
- Functions
- Chronograph
- Water resistance
- 200m
- Strap colour
- Black
- Retailer
- F.Hinds
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 (3,914), Automatic Watches (1,556), Chronograph Watches (1,190), Watches 44mm and Over (837), Sports Watches (720) and Dive Watches (514).
Manufacturer’s guarantee
What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 200m water resistance, rated for actual diving
Worth knowing
- 55.1mm is a large watch with real presence
- 16.7mm 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?
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 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.
Cheapest place to buy
F.Hinds is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
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