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The Casio F-105W-1A watch pairs a full-display electro-luminescent backlight with basic digital features and an approximate seven-year battery rating. Notebookcheck reported it at $17.97 on Amazon on October 4, 2026, or 40% below a stated $29.95 list price; that is a dated deal report, not a promise of today’s checkout price.
What the Casio F-105W-1A offers
Casio describes the F-105W-1A as a casual digital watch with a daily alarm, hourly time signal and auto calendar. Its official specifications also list a 1/100-second stopwatch, 12/24-hour time format and stated accuracy of ±30 seconds per month. See Casio’s F-105W-1A specifications.
Compact resin construction
The case measures 39 × 35.4 × 9.6 mm and the watch weighs 21 g. Casio specifies a resin case and bezel, resin band and resin glass. It is described as water resistant, but the cited product page does not give a depth rating; it does not establish suitability for swimming or diving.
Battery rating
Casio gives an approximate battery life of seven years on a CR2016. This is the manufacturer’s rating, not a guarantee of how long every watch will run; actual service life can vary with use.
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What the EL backlight changes
The F-105W-1A uses an electro-luminescent blue-green backlight that illuminates the display. That is the main practical distinction from the Casio F-91W: Notebookcheck describes the latter’s light as a corner LED, rather than the F-105W’s EL illumination across the display. The difference is a matter of lighting style and preference, not proof that one watch is better for everyone.
Casio’s QW-1549 operating guide notes that EL illumination loses power after very long-term use; it does not quantify when or by how much. The guide is available as Casio’s QW-1549 Operation Guide.
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F-105W-1A and F-91W compared
| Detail | F-105W-1A | F-91W |
|---|---|---|
| Backlight | Electro-luminescent blue-green illumination, per Casio’s official specifications | Corner LED, according to Notebookcheck’s comparison |
| Case dimensions | 39 × 35.4 × 9.6 mm, per Casio | 38.2 × 35.2 × 8.5 mm, as reported by Notebookcheck |
| Price in the October 4, 2026 deal report | $17.97 on Amazon; the price report did not provide a matched F-91W price | Not stated in the comparison report |
The F-105W-1A is slightly larger and thicker by the reported measurements. Choose between them chiefly by whether you prefer the F-105W’s illuminated display or the F-91W’s corner light; confirm each model’s current price before buying.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How good was the reported Amazon price?
Notebookcheck reported a $17.97 Amazon price on October 4, 2026, against a stated $29.95 list price, calling it 40% off. The article attributed a $20.04 90-day average and 29 consecutive days at $17.97 to Keepa. The Daily Watch’s tracker also showed $17.97 and a 40% discount, with tracked observations beginning August 10, 2026. These are dated tracker and report figures, not first-party checkout confirmations: seller, stock, shipping, current price and the reference price can change. Check the live listing before treating the discount as available. Read the Notebookcheck deal report and The Daily Watch price history for their dated context.
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Who should consider it
- Consider it if you want a lightweight, compact digital watch with an illuminated full display, alarm, stopwatch and calendar.
- Compare it with the F-91W if case thickness or the style of backlight matters more than buying whichever is cheapest.
- Do not rely on the product page’s general water-resistance wording as a swimming or diving rating.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
