Casio F-91WB-1ADF Digital Black Resin Unisex Watch

The Casio F-91WB-1ADF represents a modern, monochromatic evolution of the world's most iconic digital watch layout. Engineered for individuals who appreciate minimalist aesthetics paired with dependable functionality, this model brings a fresh, stealth-inspired black finish to a legendary silhouette. Available at Ranasinghe Watch Works, Sri Lanka’s trusted destination for authentic timepieces since 1931, the Casio F-91WB-1ADF is a versatile companion for daily routines, active lifestyle pursuits, and casual outings.

Premium Design

Understated yet distinctive, the F-91WB-1ADF features an all-black color scheme extending from its resin case to its matching strap. Unlike standard retro models with vibrant multi-colored dial accents, this variation embraces a clean, tonal layout. The minimalist face minimizes distractions while providing optimal contrast for quick time checks. It seamlessly bridges retro heritage and contemporary streetwear fashion, making it an essential accessory for any wardrobe in Sri Lanka.

Dial Features

The digital LCD display is organized for maximum clarity at a glance. It presents standard timekeeping hours, minutes, and seconds along with day-of-the-week and date indicators. An integrated LED light illuminates the screen during low-light conditions or nighttime outings, ensuring full readability around the clock. The dial layout is protected under a durable resin glass crystal, engineered to resist everyday bumps and scuffs.

Case Features

Constructed from lightweight yet durable resin, the rectangular case measures approximately 38.2 mm in height, 35.2 mm in width, and 8.5 mm in thickness. Its ultra-slim profile sits comfortably against the wrist without adding unnecessary bulk, making it easy to slip under long sleeves or athletic gear. The tough outer housing guards the internal quartz movement against moderate impacts and daily wear.

Movement

At the heart of the Casio F-91WB-1ADF is a high-precision Japanese Quartz movement. Famous for accurate timekeeping, this movement maintains an accuracy rate of within ±30 seconds per month. Powering the watch is an efficient CR2016 lithium battery, delivering an exceptional battery life of approximately 7 years under standard operational conditions.

Strap/Bracelet

The watch comes fitted with a flexible, high-grade resin band in matching matte black. Closed with a secure pin buckle clasp, the strap adjusts effortlessly to fit a wide range of wrist sizes. Resin is inherently water-resistant, sweat-proof, and easy to clean, making it ideal for the tropical climate of Sri Lanka.

Water Resistance

Designed for everyday convenience, the Casio F-91WB-1ADF carries standard water resistance suitable for daily splash exposure. It handles rain showers, handwashing, and accidental splashes without issue, giving you peace of mind throughout your everyday routine.

Comfort

Weighing in at a mere 21 grams, the F-91WB-1ADF offers an almost weightless feel on the wrist. Combined with smooth resin surfaces and an ergonomic case design, you can wear this watch comfortably from morning workouts to night shifts without wrist fatigue.

Ideal For

This unisex model is designed for anyone seeking a functional, stylish, and resilient daily watch. It serves students, professionals, fitness enthusiasts, and collectors looking for an authentic minimalist digital timekeeper. Its neutral aesthetic makes it an effortless match for daily streetwear, workwear, or weekend casual attire.

Why Buy From Ranasinghe Watch Works

When investing in a genuine timepiece, seller trust and authenticity are paramount. Established in 1931, Ranasinghe Watch Works has served generations of Sri Lankan watch enthusiasts with uncompromised quality, authentic products, and dedicated after-sales care.

• 100% Genuine Products: Sourced directly through verified channels.

• Trusted Heritage: Over 90 years of watchmaker expertise in Sri Lanka.

• Official Warranty Protection: Shop with confidence under real manufacturer warranty coverage.

• Reliable Customer Care: Expert guidance and after-sales support for every buyer.

Conclusion

The Casio F-91WB-1ADF merges iconic retro lineage with clean monochrome styling. Lightweight, highly functional, and built to last, it remains one of the smartest everyday digital watch investments available. Secure your original Casio F-91WB-1ADF today online or in-store at Ranasinghe Watch Works and enjoy timeless Japanese reliability on your wrist.

PRODUCT HIGHLIGHTS

• 100% original Casio F-91WB-1ADF digital watch available in Sri Lanka.

• Sleek monochrome black resin case and strap for modern minimalist styling.

• Ultra-lightweight 21 g construction for all-day comfort.

• Long-lasting battery life of approximately 7 years (CR2016).

• Japanese Quartz movement with precise ±30 seconds per month accuracy.

• Integrated LED backlight for clear night-time viewing.

• 1/100-second digital stopwatch for accurate event tracking.

• Daily alarm function and hourly time signals to keep your day scheduled.

• Automatic calendar function (set for 28 days for February).

• Backed by official warranty and service from Ranasinghe Watch Works (Est. 1931).

KEY FEATURES

• Brand: Casio

• Model: F-91WB-1ADF

• Gender: Unisex

• Collection: Casio Vintage / Core Digital

• Movement: Japanese Quartz

• Display: Digital LCD

• Glass: Resin Glass

• Case Material: Resin

• Band Material: Resin

• Band Color: Black

• Dial Color: Black / Monochromatic Digital

• Case Diameter: 35.2 mm

• Case Thickness: 8.5 mm

• Weight: 21 g

• Water Resistance: Water Resistant (Daily Splashes)

• Calendar: Auto-calendar (28 days for February)

• Battery: CR2016 (approx. 7-year life)

• Warranty: Official Brand Warranty

• Country of Origin: Japan Movement / Assembled in Asia

BUYING REASONS

1. Authentic Casio Quality: Guaranteed original model sourced through legitimate channels.

2. Minimalist Aesthetic: Tonal black color scheme upgrades the iconic retro shape into modern fashion.

3. Exceptional 7-Year Battery: Minimal maintenance required thanks to long-lasting battery efficiency.

4. Featherlight Comfort: At just 21 grams, it feels light on the wrist all day long.

5. Practical Daily Tools: Features an alarm, 1/100-sec stopwatch, and hourly time chimes.

6. Tropical Climate Suitable: Sweat-proof and easy-to-clean resin strap withstands local humidity.

7. Clear Night Readability: Built-in LED illuminator makes checking time easy in the dark.

8. Unisex Appeal: Proportioned perfectly for men, women, teenagers, and students.

9. Unmatched Value: High durability and performance at an accessible price point.

10. Ranasinghe Watch Works Guarantee: Backed by Sri Lanka’s trusted watch house since 1931.

SHOP MORE CASIO

• Explore the complete Casio Collection at Ranasinghe Watch Works.

LEARN MORE ABOUT THIS WATCH

• Visit the official manufacturer specs page at Casio Official Website.

FAQ

Is the Casio F-91WB-1ADF original at Ranasinghe Watch Works?

Yes, all timepieces sold at Ranasinghe Watch Works are 100% authentic and sourced through authorized distribution channels.

How long does the battery last on the Casio F-91WB-1ADF?

The watch is powered by a CR2016 battery that lasts approximately 7 years under standard operational usage.

Is this watch suitable for swimming?

The Casio F-91WB-1ADF is standard water-resistant. It easily withstands rain, sweat, and handwashing splashes, but it is not intended for swimming, snorkeling, or high-pressure water sports.

Is the Casio F-91WB-1ADF unisex?

Yes, with its 35.2 mm case width and lightweight resin build, this watch is suitable for men, women, and teenagers alike.

How do I use the LED backlight?

Press the top-left button on the watch case to activate the integrated side LED light for low-light viewing.

What warranty comes with this watch in Sri Lanka?

The watch includes an official manufacturer warranty fulfilled and supported by Ranasinghe Watch Works.

Can I replace the strap if it wears out?

Yes, standard 18 mm resin replacement straps compatible with the F-91 series can be easily fitted to this model.

What features are built into the F-91WB-1ADF digital display?

It includes a 1/100-second stopwatch, daily alarm, hourly time signal, auto-calendar, 12/24-hour time format, and LED backlight.

How heavy is the watch?

The watch is ultra-lightweight, weighing only 21 grams.

Where can I buy the Casio F-91WB-1ADF in Sri Lanka?

You can order online directly via our website at ranasinghewatchworks.lk or visit our retail store.