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Casio Vintage 41mm Unisex Watch Black
Ref. AQ-240E-1AEF
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Stepping up in the same dial colour
The AQ-240 is the softer-edged heir to the AQ-230, keeping that generation's squircle case shape but smoothing the geometry and adding a sunray finish to the black dial that catches directional light differently than the flat dials of its predecessors. At 35.8mm with an 8.1mm profile, it sits genuinely flat on the wrist — lighter than a dressed hand expects at 51 grams — and the lug-to-lug of 40.9mm means it will not overhang on a narrow wrist. The dual analogue-digital layout stays uncluttered because nothing glows: no lume paint on the hands, no backlight on the digital window. That is a deliberate trade for the minimalist look, and in practice it means the watch reads well in ordinary light but needs an external source after dark. The bracelet's sliding clasp adjusts without tools — you move the closure along the rails to fit, which makes sizing immediate and re-sizing after weight change just as straightforward.
- Reference
- AQ-240E-1AEF
- Brand
- Casio
- Collection
- Vintage
- Case size
- 41mm
- Case thickness
- 8.1mm
- Lug width
- 20mm
- Case material
- Resin
- Case shape
- Square
- Dial
- Black
- Crystal
- Acrylic
- Movement
- Quartz
- Calibre
- Module 5154
- Functions
- Date, Stopwatch, Alarm, Backlight, Dual display, Digital display
- Bracelet / strap
- Stainless steel bracelet
- Strap colour
- Silver
- Clasp
- Three-fold clasp
- Lume
- Luminous
- Retailer
- Goldsmiths
Additional specifications
- Lug-to-lug
- 40.9mm
- Weight
- 51g
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 4 collections
This watch appears in the Casio Vintage range (61), Back in Stock (4,868), Watches Under £100 (661) and Rectangular & Square Watches (474).
Manufacturer’s guarantee
What the specifications mean
Strengths
- 8.1mm is unusually slim for a 41mm case
- 40.9mm lug-to-lug keeps the 41mm case wearable
- Luminous hands and markers for low light
- Sits in the lower half of Casio's range as we list it
Worth knowing
- Acrylic crystal marks easily, though it polishes out
Also seen with this model (3)
Other versions of this model, not necessarily this exact watch.
Casio Vintage alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | AQ-240E-1AEF | RH989RX9 | 1946 |
|---|---|---|---|
| Price | £55 | £55 | £55 |
| Case size | 41mm | 41mm | 41mm |
| Water resistance | — | 100m | 50m |
| Movement | Quartz | Quartz | Quartz |
| Strap | Stainless steel bracelet | Stainless steel bracelet | Stainless steel bracelet |
| This watch | Closely matched | Closely matched |
Your new watch
Frequently asked questions, and things you should know about this watch
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.
Sapphire, mineral and acrylic comparedDoes it need a battery?
Yes. It is quartz, so expect a battery change every two to three years at a jeweller.
Quartz, automatic and solar comparedWhat size strap does it take?
20mm. 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.
How to size a watch to your wristIs 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, so there is nothing to compare it against today.
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