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Casio G-SHOCK GBA-950-9A3ER Strava Yellow Activity Tracker - W17627
Ref. GBA-950-9A3ER
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The GBA-950 is built around a partnership with Strava, and that shapes everything about it. Step counting and calorie tracking run on the watch itself, but for the measurements that matter in training — distance, pace, lap splits — it borrows the GPS from a paired phone and pushes the results directly into Strava. The donut-shaped intensity wheel on the dial turns that data into something readable at a glance mid-run. The case is carbon-reinforced resin rather than plain plastic, which keeps it at 53 grams despite the electronics inside. The strap grows directly out of the case geometry with no traditional lug connection, and the origami-engineered flex means it conforms to the wrist rather than sitting rigidly against it — practically relevant when a watch is being worn through long cardio sessions in heat. The ventilation holes along the strap are not decorative. The highlighter-yellow colourway is a deliberate visibility choice for outdoor training; the blue dual-display dial — analogue hands over a negative LCD window — sits in notable contrast to it, and both faces are covered by a Double LED Super Illuminator that floods the whole dial rather than catching only part of it.
- Reference
- GBA-950-9A3ER
- Brand
- Casio
- Collection
- G-Shock
- Case size
- 44mm
- Case material
- Resin
- Case shape
- Round
- Dial
- Blue
- Functions
- Chronograph, Date, Stopwatch, Countdown timer, Alarm, Backlight, World time, Bluetooth, Step counter, GPS, Dual display
- Water resistance
- 200m
- Bracelet / strap
- Rubber strap
- Strap colour
- Green
- 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.
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
- Luminous hands and markers for low light
- Second time zone for travelling
Worth knowing
- 44mm sits at the larger end
Compare alternatives
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| Specification | GBA-950-9A3ER |  72005 |  W1002G3 |
|---|---|---|---|
| Price | £130 | £129 | £129 |
| Case size | 44mm | 42mm | 44mm |
| Water resistance | 200m | 200m | 100m |
| Movement | Quartz | Quartz | Quartz |
| Strap | Rubber strap | Stainless steel bracelet | Stainless steel bracelet |
| 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?
Yes. It is quartz, so expect a battery change every two to three years at a jeweller.
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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