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Casio G-SHOCK GLX-5600WHR24-2ER Blue Strap Watch - Limited Edition - W17536
Ref. GLX-5600WHR24-2ER
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Western Hydrodynamic Research is a California surf brand that has spent years making beach utility products for people who treat the ocean as a working environment rather than a backdrop. This collaboration with G-Shock starts from the square-cased GLX-5600 — the platform Casio uses specifically for tide and moon data — and gives it a light blue all-resin build where the case, bezel, and strap are made from bio-based materials drawn from renewable plant sources rather than conventional petrochemical resin. The WHR logo appears engraved on the stainless steel backplate, and the tide graph display carries a mirror finish that sets it apart from the standard model. At 52.2 grams it barely registers on the wrist, and the 46.7mm lug-to-lug keeps it sitting close despite the broad square case. The Super Illuminator backlight — a step up from the standard LED — makes the tide graph and moon data readable in the water at night, where this watch is most likely to be needed. The coin battery is rated to approximately seven years, which suits a watch that will spend time well away from anywhere a charge is convenient.
- Reference
- GLX-5600WHR24-2ER
- Brand
- Casio
- Collection
- G-Shock
- Case size
- 43.2mm
- Case thickness
- 12.7mm
- Case material
- Resin
- Case shape
- Rectangular
- Dial
- Blue
- Crystal
- Mineral
- Movement
- Quartz
- Functions
- Moonphase, Stopwatch, Countdown timer, Alarm, Backlight, World time, Tide graph
- Water resistance
- 200m
- Bracelet / strap
- Rubber strap
- Strap colour
- Blue
- Clasp
- Buckle
- Lume
- Luminous
- Retailer
- F.Hinds
Additional specifications
- Lug-to-lug
- 46.7mm
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 (84), Back in Stock (3,734), Blue Dial Watches (714), Sports Watches (707), Dive Watches (505), Watches Under £100 (439) and Rectangular & Square Watches (359).
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
- 46.7mm lug-to-lug keeps the 43.2mm case wearable
- Luminous hands and markers for low light
- Second time zone for travelling
- Sits in the lower half of Casio's range as we list it
Worth knowing
- 43.2mm sits at the larger end
Casio G-SHOCK GLX-5600WHR24-2ER Blue Strap alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | GLX-5600WHR24-2ER | 30115 | RT309LX9 |
|---|---|---|---|
| Price | £79 | £70 | £80 |
| Case size | 43.2mm | 42mm | 43mm |
| Water resistance | 200m | 200m | 100m |
| Movement | Quartz | Quartz | Quartz |
| Strap | Rubber strap | Stainless steel bracelet | Stainless steel bracelet |
| This watch | Closely matched |
|
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?
Yes. It is quartz, so expect a battery change every two to three years at a jeweller.
Quartz, automatic and solar comparedWill it fit my wrist?
Lug-to-lug is 46.7mm, which suits wrists from roughly 16cm (6¼ inches) upward.
Lug-to-lug decides fit more than case diameter does.
How to size a watch to your wristCheapest 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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