The Casio G-Shock GA-100-1A1DR stands as an icon in modern tactical and street-style horology. Widely celebrated for its all-black "stealth" design, this oversized analog-digital timepiece blends rugged engineering with contemporary flair. Designed to withstand the harshest physical environments while remaining effortlessly stylish, the GA-100-1A1DR is a favorite among outdoor adventurers, athletes, tactical operators, and daily commuters across Sri Lanka. When you invest in a G-Shock, you choose uncompromising toughness—and when you shop at Ranasinghe Watch Works, you secure absolute authenticity backed by over nine decades of watchmaking excellence.

Premium Design

Every millimeter of the Casio G-Shock GA-100-1A1DR is sculpted with purpose. The matte black resin finish eliminates glare, offering a tactical aesthetic that complements both streetwear and functional outdoor gear. The three-dimensional dial architecture creates an impression of depth, featuring prominent hour markers and gear-shaped hands that give the watch its signature industrial character. This isn't just a timekeeping device; it is a bold statement piece built to weather any storm.

Dial Features

The dial of the GA-100-1A1DR is a masterpiece of functional layout design:

• Analog-Digital Hybrid Display: Enjoy the intuitive readability of analog hands combined with dual digital screens for multi-function tracking.

• Speed Indicator Sub-Dial: Located at the 12 o'clock position, this sub-dial calculates lap speeds when paired with the precision stopwatch.

• Stealth Accents: Dark grey hands and hour markers on a deep black background deliver a sleek, covert look while maintaining tactical utility.

• LED Light Support: An Auto LED light illuminated with an afterglow ensures time checking remains easy even in total darkness.

Case Features

Constructed using high-strength resin, the extra-large case measures 55×51.2mm with a thickness of 16.9mm. The hollow case structure suspends the internal module, absorbing hard impacts and directional shocks. Furthermore, the bezel features raised borders engineered to protect the mineral glass crystal and operating buttons from direct impact against flat surfaces. Magnetic resistance built to ISO 764 standards guarantees that magnetic fields from electronic devices will not compromise precision timekeeping.

Movement

At the heart of the G-Shock GA-100-1A1DR lies a high-precision Casio Japanese Quartz movement. Delivering an accuracy of ±15 seconds per month, this movement powers a suite of advanced digital complications without missing a beat:

• World Time: Displays time across 29 time zones (48 cities + UTC) with daylight saving time toggles.

• 1/1000-Second Stopwatch: Measures elapsed time, lap times, and split times with extreme scientific accuracy.

• Countdown Timer: Programmable up to 24 hours with auto-repeat functionality.

• 5 Daily Alarms: Includes 1 snooze alarm and hourly time signals to keep your day perfectly organized.

Strap/Bracelet

The watch is fitted with a heavy-duty resin band finished in matching matte black. Known for its high tensile strength and flexibility, the strap easily withstands sweat, saltwater, and harsh environmental exposure. The double-pin metal buckle provides dual-locking security on the wrist during high-impact physical activities or tactical training.

Water Resistance

With a true 200-meter (20 Bar) water resistance rating, the GA-100-1A1DR is equipped for intense aquatic activities. Whether you are swimming off the coast of Bentota, diving, snorkeling, or weathering heavy Sri Lankan monsoon rains, this timepiece remains completely impervious to water ingress.

Comfort

Despite its massive, rugged presence on the wrist, the GA-100-1A1DR weighs only 70 grams. The lightweight resin formulation prevents wrist fatigue during extended wear, while the curved case back conforms naturally to various wrist sizes for maximum ergonomic comfort.

Ideal For

• Outdoor & Tactical Enthusiasts: Built to endure hiking, camping, and rigorous physical field operations.

• Athletes & Swimmers: Precision timing features and 200m water resistance support water sports and track training.

• Everyday Urban Wearers: The all-black stealth look bridges the gap between casual streetwear and functional utility.

• Gift Buyers in Sri Lanka: A timeless, virtually indestructible present for birthdays, milestones, and celebrations.

Why Buy From Ranasinghe Watch Works

Established in 1931, Ranasinghe Watch Works is a premier watch retailer in Sri Lanka. Choosing us for your G-Shock purchase guarantees:

1. Guaranteed Authenticity: 100% original Casio G-Shock timepieces sourced directly from official distribution channels.

2. Official Warranty: Complete warranty coverage backed by expert horological technicians.

3. Heritage & Trust: Over 90 years of continuous service, craftsmanship, and customer care in Sri Lanka.

4. Fast Island-Wide Shipping: Secure, prompt home delivery across Sri Lanka.

Conclusion

The Casio G-Shock GA-100-1A1DR combines ultimate shock resistance, high-speed lap calculation, and an iconic matte black design into a single indestructible package. Experience unmatched performance on your wrist. Order your authentic G-Shock GA-100-1A1DR today from Ranasinghe Watch Works and wear a legend.

PRODUCT HIGHLIGHTS

• Iconic all-black matte "stealth" design with 3D dial construction

• Legendary G-Shock structural resistance against drop impacts and vibrations

• ISO 764 compliant magnetic resistance for uninterrupted performance

• Professional 200-meter (20 Bar) water resistance suitable for swimming and diving

• Ultra-precise 1/1000-second stopwatch with lap speed calculation

• World Time function covering 29 time zones and 48 cities worldwide

• Auto LED light switch with selectable illumination duration and afterglow

• Lightweight 70-gram high-durability resin case and strap setup

• Secure double-pin buckle closure for maximum wrist stability

• 100% genuine Casio backed by Ranasinghe Watch Works official warranty in Sri Lanka

KEY FEATURES

• Brand: Casio

• Model: G-Shock GA-100-1A1DR

• Gender: Men

• Collection: G-Shock (Analog-Digital Combination)

• Movement: Japanese Quartz

• Display: Analog-Digital Hybrid

• Glass: Mineral Glass

• Case Material: Resin

• Band Material: Resin

• Band Color: Matte Black

• Dial Color: Black / Dark Grey

• Case Diameter: 51.2 mm

• Case Thickness: 16.9 mm

• Weight: 70 g

• Water Resistance: 200 Meters / 20 Bar

• Calendar: Full Auto-Calendar (pre-programmed to the year 2099)

• Battery: CR1220 (approximate 2-year battery life)

• Warranty: Official Manufacturer Warranty / Retailer Guarantee

• Country of Origin: Japan Movement / Assembled in Casio Authorized Facilities

BUYING REASONS

1. Unrivaled Shock Protection: Built with G-Shock's patented hollow-case protection structure.

2. Stealth Tactical Styling: The matte black colorway blends effortlessly into streetwear and tactical gear.

3. 200m Deep Water Ready: Ideal for water sports, open-water swimming, and tropical rainfall.

4. Scientific Timing Accuracy: Features a 1/1000-second stopwatch capable of measuring speed parameters.

5. Global Travel Companion: Effortlessly switch between 29 world time zones.

6. Featherlight Comfort: Large presence on the wrist without heavy, restrictive mass (only 70g).

7. Resistant to Magnetic Interference: Built to maintain accuracy around everyday electronic gear.

8. Low Maintenance: Long-lasting CR1220 battery ensures years of hassle-free performance.

9. Guaranteed Originality: Purchasing from Ranasinghe Watch Works ensures 100% authentic stock.

10. 90+ Years of Customer Trust: Backed by Sri Lanka's leading horology specialists since 1931.

SHOP MORE CASIO

Explore our complete catalog of authentic Casio timepieces in Sri Lanka:

• Casio Collection: https://ranasinghewatchworks.lk/product?type=watch&brand=casio

LEARN MORE ABOUT THIS WATCH

For official manuals, technical specifications, and detailed module support, visit:

• Official Casio International Website: https://www.casio.com/international/watches/gshock/

FAQ

Is the Casio G-Shock GA-100-1A1DR original at Ranasinghe Watch Works?

Yes, all timepieces sold at Ranasinghe Watch Works are 100% original, brand-new, and sourced through official distribution channels with authentic warranties.

Can I swim or dive with the G-Shock GA-100-1A1DR?

Yes. The watch features a 200-meter (20 Bar) water resistance rating, making it completely safe for swimming, snorkeling, water sports, and shallow diving.

What is the battery lifespan of the GA-100-1A1DR?

The watch is powered by a CR1220 battery, providing an estimated battery life of approximately 2 years under standard usage conditions.

Does this watch feature an automated light function?

Yes, the GA-100-1A1DR includes an Auto LED light feature that automatically illuminates the display when you tilt your wrist toward your face in low-light environments.

What are the physical dimensions of the GA-100-1A1DR?

The case measures 55.0 mm in height, 51.2 mm in width, and 16.9 mm in thickness, weighing a comfortable 70 grams.

Does the watch display world time?

Yes, the integrated digital system supports 29 world time zones, representing 48 major global cities plus Universal Coordinated Time (UTC).

What does "magnetic resistant" mean on this G-Shock model?

The watch meets ISO 764 standards for magnetic resistance, meaning everyday electronics like smartphones and laptops will not disrupt its Quartz accuracy.

Is the G-Shock GA-100-1A1DR covered by a warranty in Sri Lanka?

Yes, every GA-100-1A1DR purchased from Ranasinghe Watch Works comes with an official warranty and local customer support.

Does Ranasinghe Watch Works offer island-wide delivery in Sri Lanka?

Yes, we deliver original watches safely and securely across all districts and towns in Sri Lanka.

How do I clean and maintain my resin G-Shock strap?

Simply wash the resin case and strap with mild soap and fresh water after exposure to saltwater, sweat, or dirt, then wipe dry with a soft cloth.