Casio F-91W Classic Retro Quartz Digital Watch Black Resin (F-91W-1YEF)
- Sale price
- R 488
- List price
- R 650
The Casio F-91W is a horological icon that transcends generations. First introduced in 1989, this legendary digital timepiece has become the quintessential expression of functional minimalism, beloved by everyone from students to engineers, adventurers to presidents. Its rectangular black resin case, measuring a compact 33.2mm × 35.2mm × 8.5mm and weighing just 21 grams, houses Casio's reliable quartz module 593—a movement engineered for unwavering accuracy and legendary battery longevity of up to seven years. The high-contrast digital display presents time in crisp segments, flanked by dual illumination modes and framed by a distinctive blue accent line that has become synonymous with this model.
Functionality defines the F-91W's DNA. Beyond basic timekeeping, this watch features a 1/100-second stopwatch capable of measuring up to 59 minutes 59.99 seconds, a daily alarm, hourly time signal, and an auto-calendar pre-programmed to the year 2099. The LED backlight ensures legibility in low-light conditions, while 30-metre water resistance provides protection against splashes and brief immersion. At Cassim & Co., we recognise this watch not merely as an accessory, but as a masterclass in purposeful design—a timepiece that has remained fundamentally unchanged for over three decades because its formula was perfected from inception.
The F-91W's cultural significance extends far beyond its technical specifications. It has appeared on the wrists of everyone from tech entrepreneurs to military personnel, featured in countless films, and inspired a devoted global following of enthusiasts who appreciate its honest, utilitarian aesthetic. The black resin bracelet features an adjustable buckle clasp accommodating wrist sizes from 145mm to 200mm, ensuring universal fit and all-day comfort. Visit us at our Mall of the South boutique to experience this icon in person, or browse our complete range of CASIO watches to discover how this Japanese manufacturer continues to blend innovation with accessibility.
At R488.00, the F-91W represents extraordinary value—a genuine Casio watch backed by a 1-year international manufacturer warranty. Our watch servicing and repairs team stands ready to assist with battery replacements and any servicing needs throughout the life of your timepiece. Whether you're seeking your first digital watch, a reliable travel companion, or simply want to own a piece of horological history, the F-91W delivers uncompromising functionality wrapped in timeless design.
Specifications
- Reference: F-91W-1YEF
- Movement: Casio Quartz Module 593
- Battery Life: Approximately 7 years (CR2016)
- Display: Digital LCD with multi-function display
- Case Dimensions: 33.2mm × 35.2mm × 8.5mm
- Case Material: Black resin
- Case Shape: Rectangular
- Crystal: Acrylic
- Bezel Material: Black resin
- Dial: Digital LCD (grey background)
- Bracelet Material: Black resin
- Bracelet Type: Integrated resin strap
- Clasp Type: Adjustable buckle
- Wrist Size: 145mm to 200mm
- Weight: 21 grams
- Water Resistance: 30 metres (3 ATM / 3 Bar)
- Functions: Hour, minute, second, date, day, 12/24-hour format
- Chronograph: 1/100-second stopwatch (59'59.99'' capacity)
- Alarm: Daily alarm with hourly time signal
- Calendar: Auto-calendar (pre-programmed to year 2099)
- Illumination: LED backlight
- Accuracy: ±30 seconds per month
- Origin: Japan (design and engineering)
- Warranty: 1-year international Casio warranty
FAQ
Q: How long does the battery last in the Casio F-91W?
A: The F-91W is equipped with a CR2016 battery that provides approximately 7 years of operation under normal use. Battery life may vary depending on usage of the LED backlight and stopwatch functions. When replacement is needed, visit our Mall of the South boutique for professional battery service.
Q: Is the F-91W water-resistant enough for swimming?
A: The F-91W has 30-metre (3 ATM) water resistance, which protects against splashes, rain, and brief immersion such as handwashing. However, it is not suitable for swimming, showering, or water sports. Avoid operating the buttons while the watch is wet or submerged.
Q: What is the wrist size range for this watch?
A: The resin strap accommodates wrist circumferences from 145mm to 200mm through its adjustable buckle clasp system. This provides a comfortable fit for the vast majority of wearers, from smaller to larger wrist sizes.
Q: Does the F-91W have an alarm and stopwatch function?
A: Yes. The F-91W features a daily alarm with hourly time signal functionality, plus a 1/100-second precision stopwatch capable of measuring elapsed time up to 59 minutes 59.99 seconds. The stopwatch includes split-time measurement capability.
Q: How do I activate the LED backlight?
A: Press the upper-right button to activate the LED backlight, which illuminates the digital display for approximately 2 seconds. The backlight is particularly useful for reading the time in low-light conditions or at night.
Q: Is this the original Casio F-91W or a variant?
A: This is the authentic Casio F-91W-1YEF, the classic original model with black resin case and bracelet. As an authorised Casio retailer, Cassim & Co. stocks only genuine Casio timepieces backed by the manufacturer's international warranty.
Q: Can the resin strap be replaced if it wears out?
A: While the F-91W features an integrated resin strap design, replacement straps are available from Casio. Our watch servicing team can assist with strap replacements and advise on compatible options to keep your F-91W in optimal condition for years to come.
Warranty
- This Casio F-91W is covered by a 1-year international Casio warranty from the date of purchase when purchased from an authorised retailer.
- The warranty covers manufacturing defects in materials and workmanship under normal use conditions.
- The warranty does not cover: normal wear and tear, battery replacement, scratches or cosmetic damage to the case/crystal/bracelet, water damage resulting from misuse or failure to observe water-resistance limitations, damage from accidents or improper handling, or unauthorised repairs or modifications.
- To validate your warranty, retain your original proof of purchase from Cassim & Co. This receipt must be presented for any warranty claims.
- Warranty service must be performed by an authorised Casio service centre. Cassim & Co. will facilitate warranty claims and can direct you to the appropriate service channels.
- The water-resistant seal is not covered under warranty, as it is subject to normal wear and may require periodic testing and gasket replacement (a standard maintenance item).
- Battery replacement is considered routine maintenance and is not covered under the manufacturer warranty, though our team offers this service at competitive rates.
- For any questions regarding your Casio warranty or servicing needs, contact our boutique at Mall of the South or consult our watch servicing specialists.
Care Guide
- Clean the resin case and bracelet regularly with a soft, slightly damp cloth to remove dirt, perspiration, and oils. Avoid harsh chemicals or solvents.
- Dry the watch thoroughly after exposure to water, especially around the case back and button areas where moisture may accumulate.
- Do not operate any buttons while the watch is wet or submerged, as this may compromise the water-resistant seal.
- Avoid exposing the watch to extreme temperatures (below 0°C or above 50°C), direct sunlight for extended periods, or strong magnetic fields.
- The acrylic crystal may scratch more easily than sapphire; avoid contact with abrasive surfaces or materials.
- Store the watch in a cool, dry place when not in use, away from chemicals, perfumes, or cleaning products that may degrade the resin material.
- Battery replacement should be performed by a qualified technician to ensure proper sealing and water resistance. Visit our boutique for professional battery service.
- If the digital display becomes faint or digits appear incomplete, this typically indicates the battery requires replacement.
- The resin material may gradually change colour with prolonged UV exposure or age—this is a normal characteristic of resin watches.
- For optimal longevity, avoid dropping or subjecting the watch to strong impacts, as this may damage the internal quartz module or LCD display.