Casio F-91WB Digital Quartz Black Resin Watch (F-91WB-1ADF)
- Sale price
- R 750
- List price
- R 999
The Casio F-91WB-1ADF is a modern reimagining of an icon. Building on the legendary F-91W platform that has defined accessible timekeeping for decades, this all-black variant delivers the same uncompromising functionality in a sleek, contemporary aesthetic. The matte black resin case and bracelet create a monochromatic statement, while the digital LCD display maintains the crisp legibility that made the original a global phenomenon.
At Cassims & Co., we recognise that true horological value isn't always measured in complications or precious metals. The F-91WB represents Casio's mastery of quartz technology: a 1/100-second stopwatch, daily alarm, hourly time signal, and LED backlight, all powered by a battery that can run for years. The lightweight resin construction ensures day-long comfort, while water resistance protects against daily exposure. This is a watch that simply works, day after day, year after year.
Whether you're drawn to its retro-digital charm, its unmatched reliability, or its cult status in watch collecting circles, the F-91WB-1ADF delivers substance over flash. Browse our full range of CASIO watches to explore the entire collection, from vintage-inspired digitals to advanced G-SHOCK models. Visit us at our Mall of the South boutique in Johannesburg to experience the F-91WB in person, and discover why this humble timepiece has earned its place in horological history.
For battery replacements or any technical support, our watch servicing and repairs team is always on hand to keep your Casio running perfectly. We offer nationwide delivery across South Africa, bringing this iconic timepiece to your door with full warranty protection.
Specifications
- Reference Number: F-91WB-1ADF
- Case Material: Resin
- Case Colour: Black
- Case Dimensions: 38.2mm × 35.2mm × 8.5mm (L × W × H)
- Weight: Approximately 21g
- Crystal: Acrylic
- Dial Colour: Black with digital LCD display
- Bracelet Material: Resin
- Bracelet Colour: Black
- Movement Type: Quartz digital
- Water Resistance: Water resistant (splash resistant)
- Functions: Time and calendar display, 1/100-second stopwatch (59'59.99" capacity), elapsed time, split time, 1st-2nd place times, daily alarm, hourly time signal, LED backlight
- Battery Life: Approximately 7 years on CR2016 battery
- Warranty: 1-year international Casio warranty
- SKU: CO293
- Barcode/GTIN: 4549526378331
FAQ
Q: Is the F-91WB-1ADF suitable for swimming?
A: The F-91WB is water resistant, meaning it can handle splashes, rain, and hand washing, but it is not suitable for swimming, showering, or submersion. Casio does not rate this model for recreational water activities.
Q: How long does the battery last in this watch?
A: Under normal use, the CR2016 battery in the F-91WB-1ADF provides approximately 7 years of operation. When replacement is needed, visit our Mall of the South boutique for professional battery service.
Q: What is the difference between the F-91WB and the original F-91W?
A: The F-91WB-1ADF features an all-black aesthetic with matte black resin case and bracelet, whereas the classic F-91W has a silver-tone case. The core functionality and dimensions remain identical—this is purely a design evolution.
Q: Can the resin bracelet be adjusted or replaced?
A: The integrated resin strap is designed to fit a wide range of wrist sizes and can be trimmed if necessary. Replacement straps are available through authorised Casio service centres, including our Johannesburg location.
Q: Does this watch have an alarm and stopwatch function?
A: Yes, the F-91WB-1ADF includes a daily alarm, hourly time signal, and a 1/100-second stopwatch with split time and dual finisher timing capability—making it ideal for everyday timekeeping and basic athletic use.
Q: Is this watch covered by an international warranty?
A: Yes, when purchased from an authorised retailer like Cassims & Co., the F-91WB-1ADF carries a 1-year international Casio warranty covering manufacturing defects. Proof of purchase is required for warranty claims.
Q: How do I activate the LED backlight on this watch?
A: Press the top-left button to illuminate the digital display. The LED backlight provides clear visibility in low-light conditions, lasting approximately 3 seconds per activation.
Warranty
- The Casio F-91WB-1ADF carries a 1-year international Casio warranty from the date of purchase when bought from an authorised retailer such as Cassims & Co.
- The warranty covers manufacturing defects in materials and workmanship under normal use conditions.
- The warranty does not cover normal wear and tear, including scratches, crystal damage, resin discolouration, or battery depletion.
- Water damage resulting from misuse, submersion beyond the watch's resistance rating, or button operation while wet is not covered.
- Accidental damage, unauthorised modifications, repairs performed by non-authorised service centres, or damage from chemical exposure are excluded from warranty coverage.
- To make a warranty claim, proof of purchase from an authorised retailer is required. Retain your original receipt.
- Battery replacement is considered a routine maintenance service and is not covered under warranty, though we offer this service at our Johannesburg boutique.
- Casio reserves the right to repair or replace defective components at their discretion during the warranty period.
Care Guide
- Clean the resin case and bracelet regularly with a soft, damp cloth to remove perspiration, dirt, and oils that can degrade the material over time.
- Avoid exposure to solvents, perfumes, cosmetics, and harsh chemicals, as these can damage the resin finish and cause discolouration.
- Do not expose the watch to extreme temperatures or prolonged direct sunlight, which can affect the resin's integrity and the LCD display's contrast.
- Although water resistant, do not press any buttons while the watch is wet, and ensure the watch is dry before operating functions to prevent moisture ingress.
- Store the watch in a cool, dry place when not in use, away from magnetic fields and electronic devices that may interfere with quartz accuracy.
- When the display begins to dim or functions become sluggish, replace the battery promptly to prevent potential leakage. Visit our Mall of the South boutique for professional battery replacement.
- Avoid dropping or impacting the watch, as the acrylic crystal and resin case can crack or scratch under force.
- If the watch will not be worn for an extended period, remove it from direct sunlight and ensure it is stored in a stable environment to preserve battery life.