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Casio Collection 40.9mm x 35.8mm Unisex Watch
Ref. AQ-240EG-9AEF
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Stepping up in Casio's range
The AQ-240 is the first update to the AQ-230 series in nearly three decades — a lineage that quietly accumulated an outsized following precisely by refusing to overcomplicate itself. The square silhouette has been softened slightly at the corners, which is the only meaningful change Casio saw fit to make, and that restraint is a form of respect for the original. At 51 grams the watch is barely present on the wrist, and at 8.1mm it disappears under a sleeve without argument. The analogue hands sit above a digital readout at six o'clock — a layout that keeps both displays legible without either competing for attention. The gold-toned bracelet uses a sliding clasp that adjusts without tools, which removes the usual obstacle of resizing at home.
- Reference
- AQ-240EG-9AEF
- Brand
- Casio
- Collection
- VintageCase Size: 35
- Case size
- 40.9mm
- Case thickness
- 8.1mm
- Lug width
- 18mm
- Case material
- Resin
- Case shape
- Square
- Dial
- Gold
- Crystal
- Acrylic
- Movement
- Quartz
- Functions
- Date, Stopwatch, Alarm, Dual display, Digital display
- Water resistance
- 30m
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Gold
- Clasp
- Folding clasp
- Lume
- Luminous
- Retailer
- Goldsmiths
Additional specifications
- Lug-to-lug
- 40.9mm
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 2 collections
This watch appears in Watches Under £100 (652) and Rectangular & Square Watches (401).
Manufacturer’s guarantee
What the specifications mean
Strengths
- 8.1mm is unusually slim for a 40.9mm case
- 40.9mm lug-to-lug keeps the 40.9mm case wearable
- Luminous hands and markers for low light
- Sits in the lower half of Casio's range as we list it
Worth knowing
- 30m means keeping it away from water
- Acrylic crystal marks easily, though it polishes out
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | AQ-240EG-9AEF | 30349 | GS05983/03 |
|---|---|---|---|
| Price | £75 | £75 | £76 |
| Case size | 40.9mm | 41mm | 40mm |
| Water resistance | 30m | 50m | 50m |
| Movement | Quartz | Quartz | Quartz |
| 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?
No. At 30m it will survive rain and handwashing, but not submersion of any kind.
Will the glass scratch?
Yes, but it polishes out. Acrylic marks easily and a scratch can be buffed away at home, which is why vintage-style watches still use it.
Does it need a battery?
Yes. It is quartz, so expect a battery change every two to three years at a jeweller.
What size strap does it take?
18mm. Any strap of that width will fit, and on most modern watches quick-release bars make the swap a two-minute job with no tools.
Will it fit my wrist?
Lug-to-lug is 40.9mm, which suits wrists from roughly 15cm (6 inches) upward.
Lug-to-lug decides fit more than case diameter does.
Is it a men's or women's watch?
Listed as unisex, and at this size it suits any wrist that takes the dimensions.
Cheapest place to buy
Goldsmiths is the only UK retailer we track stocking this reference new, at £75. There is nothing to compare it against today.
Who are Goldsmiths?
Goldsmiths has been selling watches in Britain since 1778 and is part of the Watches of Switzerland Group, which is listed on the London Stock Exchange. They are an authorised dealer, so a watch comes with the manufacturer’s own warranty.
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