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Casio Edifice EFS-S650D-3AEF Solar Chronograph Bracelet Watch - W17548
Ref. EFS-S650D-3AEF
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The EFS-S650D sits within the first Edifice sub-line to use a polished ceramic bezel — a material choice that reads as subtle until you notice, months in, that it has not acquired a single mark while the rest of the case shows the usual traces of daily life. The green striped dial gives it a motorsport register without being loud about it, the pattern becoming more animated as light crosses it at an angle. At 11.7mm thick, the case sits noticeably close to the wrist for a 100-metre-rated chronograph of this kind, and the 40.9mm diameter keeps it well clear of the wrist edge without dominating the cuff. The solar calibre behind it carries a five-month power reserve, which in practice means the watch can sit unworn through a long holiday and return to service without a charge cycle. The integrated bracelet runs flush with the case and adjusts via friction pins rather than a proprietary tool, which is worth knowing the first time sizing is needed.
- Reference
- EFS-S650D-3AEF
- Brand
- Casio
- Collection
- Edifice
- Case size
- 40.9mm
- Case thickness
- 11.7mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Green
- Crystal
- Sapphire
- Movement
- Solar
- Calibre
- 5529
- Functions
- Chronograph, Date, Power reserve indicator, Solar powered
- Water resistance
- 100m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- 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.
Manufacturer’s guarantee
What the specifications mean
Strengths
- 100m water resistance covers swimming and watersports
- 46.7mm lug-to-lug keeps the 40.9mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | EFS-S650D-3AEF |  BM7530-50X |  HB1514031 |
|---|---|---|---|
| Price | £175 | £199 | £189 |
| Case size | 40.9mm | 41mm | 44mm |
| Water resistance | 100m | 100m | 50m |
| Movement | Solar | Solar | Solar |
| Strap | Stainless steel bracelet | Stainless steel bracelet | Leather strap |
| This watch |
|
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 100m it is rated for swimming and snorkelling, though not for diving.
Will the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
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 46.7mm, which suits wrists from roughly 16cm (6¼ 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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