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Casio Edifice EFK-100CD-1AER Automatic Bracelet Watch - W17544
Ref. EFK-100CD-1AER
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 146 Casio watches in stock.The EFK-100CD marks Casio's first venture into mechanical automatic watchmaking — a significant step for a brand that built its reputation entirely on electronics. The movement inside is the Seiko NH35, here badged as Casio's Module 5755, which brings hacking seconds and hand-winding to a company that has never before offered either. That Casio reached to one of Japan's most trusted workhorse calibres for its debut says something about how seriously it treated the exercise. At 39mm across and 43.5mm lug to lug, it sits closer to a dress watch in footprint than the sports-car language of the dial might suggest, and 148 grams on the wrist is noticeable without being burdensome. The dial is formed from forged carbon — compressed fibre and resin rather than a printed texture — so the patterning shifts fractionally with the light in a way a photograph does not quite capture. The two micro-adjust positions on the clasp are worth knowing about: they make the difference between a bracelet that fits and one that actually settles.
- Reference
- EFK-100CD-1AER
- Brand
- Casio
- Collection
- Edifice
- Case size
- 39mm
- Case thickness
- 12.5mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- NH35
- Functions
- Date
- 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
- 43.5mm
- Power reserve
- 40 hours
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 5 collections
This watch appears in the Casio Edifice range (21), Back in Stock (5,018), Stainless Steel Watches (3,307), Automatic Watches (1,811) and Automatic Watches Under £500 (355).
Manufacturer’s guarantee
What the specifications mean
A mechanical watch for everyday wear.
Strengths
- 100m water resistance covers swimming and watersports
- 39mm suits most wrists
- 43.5mm lug-to-lug keeps the 39mm case wearable
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
Worth knowing
- 40-hour reserve means winding it after a day off
Casio Edifice EFK-100CD-1AER alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | EFK-100CD-1AER | SRPG35K1 | RGB10037/04 |
|---|---|---|---|
| Price | £289 | £290 | £289 |
| Case size | 39mm | 39.4mm | 40mm |
| Water resistance | 100m | 100m | 100m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Stainless steel bracelet | Fabric strap | Stainless steel bracelet |
| Power reserve | 40 hours | 41 hours | — |
| This watch | Closely matched | Closely matched |
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.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
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 comparedHow long does it run for when it's not worn?
About 40 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
Will it fit my wrist?
Lug-to-lug is 43.5mm, which suits wrists from roughly 15cm (6 inches) upward.
Lug-to-lug decides fit more than case diameter does.
How to size a watch to your wristIs it a men's or women's watch?
Listed as men's, though at 39mm it sits in the range that suits anyone.
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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