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Casio G-SHOCK GPR-H1000-1ER Master Of G Rangeman Black Strap Watch - W17645
Ref. GPR-H1000-1ER
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 £919 across 129 Casio watches in stock.The original Rangeman established Casio's template for a watch that could absorb genuine field abuse — mud, shock, pressure — and still deliver sensor data on demand. The GPR-H1000 carries that forward and adds GPS sync and optical heart rate monitoring, functions that shift it from pure survival tool into something a runner or altitude hiker would also reach for. Multi-band radio control has been dropped in exchange for GPS, which means it sets itself accurately anywhere on the planet rather than depending on broadcast signal. At 53.2mm it is unambiguously large, but 92 grams is a serious undercut on what that footprint suggests, and the curved underside of the casing distributes that across the wrist rather than sitting proud of it. The MIP display — a negative screen that reads white-on-black — stays legible in full sunlight without a backlight, which matters more than brightness when the battery is working hardest. Metal side-guards protect the heart rate sensor and charge port where they are most exposed, and the mud-resistant button structure means the controls stay operable in conditions that would gum up a conventional crown.
- Reference
- GPR-H1000-1ER
- Brand
- Casio
- Collection
- G-Shock
- Case size
- 53.2mm
- Case thickness
- 20.3mm
- Case material
- Resin
- Case shape
- Round
- Dial
- Black
- Functions
- Stopwatch, Countdown timer, Alarm, Backlight, World time, Solar powered, Bluetooth, Step counter, Heart rate, GPS, Compass, Thermometer, Altimeter, Tide graph, Digital display
- Water resistance
- 200m
- Bracelet / strap
- Rubber strap
- Strap colour
- Black
- Retailer
- F.Hinds
Additional specifications
- Lug-to-lug
- 60.6mm
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.
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
- 60.6mm lug-to-lug keeps the 53.2mm case wearable
- Luminous hands and markers for low light
- Second time zone for travelling
- One of Casio's more premium watches
Worth knowing
- 53.2mm is a large watch with real presence
- 20.3mm thick, so it will not disappear under a cuff
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | GPR-H1000-1ER |  010-02935-03 |
|---|---|---|
| Price | £449 | £390 |
| Case size | 53.2mm | 50mm |
| Water resistance | 200m | 100m |
| Movement | Solar | Solar |
| Strap | Rubber strap | 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.
Will the glass scratch?
It can, over time. Mineral glass handles daily wear but will pick up fine scratches that sapphire would not.
Does it need a battery?
No. It charges from light, and the cell behind that is designed to last a decade or more.
Will it fit my wrist?
Lug-to-lug is 60.6mm, which suits wrists from roughly 18.5cm (7¼ inches) upward.
Lug-to-lug decides fit more than case diameter does.
Is 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.
Who are F.Hinds?
F.Hinds has been run by the same family since 1856 and is now in its fifth generation, with more than 115 shops across England and Wales. They are a member of the Responsible Jewellery Council and an Authorised Diamond Dealer.
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