Casio F-91W Digital Chronograph Alarm Black Resin Quartz Watch (F-91W-1)
- Price
- R 650
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🚚1–2 day delivery nationwide
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The Casio F-91W is an icon of horological pragmatism — a digital timepiece that has transcended generations since its introduction in 1989. This is the watch that proves exceptional functionality need not be complicated. With its distinctive rectangular resin case, crisp digital display, and featherweight 21-gram construction, the F-91W-1 delivers chronograph precision, daily alarm, and 7-year battery life in a package slim enough to slip under any cuff. At Cassim & Co., we are proud to offer this legendary timekeeper as authorised CASIO watches retailers, ensuring every piece carries full international warranty protection.
The F-91W-1 is engineered for reliability. Its quartz module maintains accuracy to within ±30 seconds per month, whilst the 1/100-second stopwatch measures elapsed time, split time, and 1st-2nd place finishing times with precision. The LED backlight illuminates the resin glass display on demand, and water resistance to 30 metres protects against splashes and rain. The black resin strap and case create a monochromatic aesthetic that works equally well in the boardroom or on the trail. This is functional design distilled to its essence — no superfluous complications, no decorative excess, just dependable timekeeping in a compact 38.2 × 35.2 × 8.5 mm form.
Worn by everyone from military personnel to design enthusiasts, the F-91W has earned cult status for its unpretentious excellence. The digital display shows hour, minute, second, AM/PM indicator, date, and day with instant legibility. The daily alarm ensures you never miss an important moment, whilst the auto-calendar remains accurate through 2099. At just R488.00, this is accessible Swiss-level reliability from Japan's most trusted name in digital timekeeping. Visit us at our Mall of the South boutique to experience this classic in person, or take advantage of our nationwide delivery service across South Africa.
For those who value substance over ostentation, the F-91W-1 represents a considered choice. Its exceptional 7-year battery life means years of maintenance-free operation, and when service is eventually required, our watch servicing and repairs team provides expert battery replacement and technical support. This is a watch that asks nothing of you except to be worn — and in return, it delivers decades of faithful service. Few timepieces at any price can make that claim with such credibility.
Specifications
- Reference Number: F-91W-1
- Movement: Quartz digital module
- Accuracy: ±30 seconds per month
- Case Material: Black resin
- Case Dimensions: 38.2 × 35.2 × 8.5 mm
- Case Thickness: 8.5 mm
- Weight: 21 grams
- Crystal: Resin glass
- Dial: Digital LCD display
- Strap Material: Black resin
- Water Resistance: 30 metres (3 ATM) — splash and rain resistant
- Functions: Hour, minute, second, PM indicator, date, day display
- Chronograph: 1/100-second stopwatch (59'59.99'' capacity)
- Stopwatch Modes: Elapsed time, split time, 1st-2nd place times
- Alarm: Daily alarm with hourly time signal
- Illumination: LED backlight
- Calendar: Auto-calendar (pre-programmed to year 2099)
- Battery Life: Approximately 7 years (CR2016 battery)
- Warranty: 1-year international Casio warranty
FAQ
Q: Is the F-91W water-resistant enough for swimming?
A: The F-91W is rated to 30 metres (3 ATM), which means it is splash-resistant and can withstand rain or brief contact with water whilst washing hands. However, it is not suitable for swimming, showering, or any water immersion activities. The 30m rating is a pressure equivalence test and does not indicate diving depth suitability.
Q: How long will the battery last in this watch?
A: Casio specifies approximately 7 years of battery life from the CR2016 cell included with the watch. Actual duration depends on use of the backlight and alarm functions — conservative use of these features will maximise battery longevity.
Q: Can the strap be replaced if it wears out?
A: Yes, the resin strap is replaceable. Casio produces replacement straps for the F-91W, and our service team can source and fit genuine Casio straps to maintain the watch's authenticity and performance.
Q: Does this watch have an hourly time signal?
A: Yes, the F-91W features an hourly time signal that can be activated or deactivated according to your preference. When enabled, the watch emits a brief beep at the top of each hour.
Q: How accurate is the quartz movement in this watch?
A: The F-91W's quartz module maintains accuracy to within ±30 seconds per month under normal operating conditions (temperature range of 0°C to 40°C). This translates to approximately ±6 minutes per year — exceptional precision for a digital quartz timepiece at this price point.
Q: Is this an original Casio watch with warranty?
A: Absolutely. As authorised Casio retailers, every F-91W we sell is 100% genuine and carries the full 1-year international Casio warranty valid from the date of purchase. We provide official warranty documentation with every watch.
Q: Will this watch fit a larger wrist comfortably?
A: The F-91W's resin strap is designed to fit wrist circumferences from approximately 145mm to 205mm. The lightweight 21-gram construction and slim 8.5mm profile ensure comfort even during extended wear. If adjustment is needed, our team can assist with strap modification or replacement options.
Warranty
- This watch carries a 1-year international Casio warranty from the date of purchase, valid when purchased from an authorised retailer such as Cassim & Co.
- The warranty covers manufacturing defects in materials and workmanship under normal use conditions.
- The warranty does not cover: normal wear and tear, battery replacement, resin case or strap deterioration due to age or use, accidental damage, water damage resulting from misuse or improper button operation whilst wet, unauthorised modifications or repairs, or damage from extreme conditions.
- To claim warranty service, proof of purchase from an authorised Casio retailer is required — please retain your original receipt.
- Warranty service must be performed by authorised Casio service centres to maintain validity — unauthorised repairs void the warranty immediately.
- The resin strap and case finish are considered consumable items and are not covered under the warranty terms.
- Battery replacement is a routine maintenance procedure and is not covered under warranty — the initial battery is supplied for function testing and may have reduced capacity at the time of purchase.
Care Guide
- Clean the resin case and strap regularly with a soft, slightly damp cloth to remove oils, dirt, and perspiration that can degrade the material over time.
- Avoid exposing the watch to extreme temperatures above 60°C or below 0°C, as this may affect the LCD display clarity and quartz module accuracy.
- Do not press any buttons whilst the watch is wet, as this may compromise the water resistance seals and allow moisture ingress.
- Keep the watch away from strong magnetic fields (speakers, magnetic clasps, MRI equipment) which may temporarily affect timekeeping accuracy.
- Remove the watch before showering, swimming, or engaging in water sports — the 30m rating is for splash resistance only, not immersion.
- When the display becomes dim or the watch stops functioning, replace the CR2016 battery promptly to prevent potential leakage damage to the module.
- Store the watch in a cool, dry place away from direct sunlight when not in use to preserve the resin components and LCD longevity.
- Avoid contact with solvents, cosmetics, perfumes, and harsh chemicals that may discolour or damage the resin case and strap.
- If the watch requires battery replacement or service, visit our authorised service centre to ensure genuine Casio parts and correct resealing procedures are used.