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The Verdict

The Casio G-Shock GD100-1B is a tactical powerhouse built for environments where equipment failure isn't an option. It trades the complexity of solar and atomic syncing for raw reliability, centered around a massive 7-year battery life and a high-intensity Super Illuminator LED that ensures exceptional visibility in total darkness. Users gravitate toward its stealth-black aesthetic and surprisingly lightweight feel, despite its oversized "XL" case.

Value vs. Trade-off:
The primary compromise is the negative display legibility, which can be tricky to read in dim lighting or at certain angles without the backlight. Additionally, the 17.4mm thickness makes it notably bulky, often catching on tight sleeves. However, these are minor trade-offs for indestructible shock resistance and 200M water depth protection at a sub-$100 price point. The extreme battery longevity and high-utility backlight make the GD100-1B a definitive buy for anyone needing a rugged, low-maintenance tool that prioritizes survival over status.

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Rating
Display TypeDigital (Screen)Digital (Screen)Analog-Digital (Both)Digital (Screen)Digital (Screen)Digital (Screen)Digital (Screen)
BrandCasioCasioCasioCasioG-ShockTimexTimex
FeaturesGMT / Dual Time Zone, Luminous Hands & MarkersChronograph (Stopwatch), Alarm, GMT / Dual Time ZoneAlarm, GMT / Dual Time ZoneChronograph (Stopwatch), Alarm, Luminous Hands & Markers, GMT / Dual Time ZoneChronograph (Stopwatch), GMT / Dual Time ZoneChronograph (Stopwatch), Day-Date Display, Luminous Hands & Markers, GMT / Dual Time Zone, AlarmChronograph (Stopwatch), Day-Date Display, Alarm, Luminous Hands & Markers, GMT / Dual Time Zone
Water ResistanceDiving (200M & Up)Diving (200M & Up)Diving (200M & Up)Diving (200M & Up)Diving (200M & Up)Swimming (50M - 100M)Swimming (50M - 100M)
Dial ColorBlackBlackBlackBlueBlackBlackGray
GenderMensMensMensMensMensMensMens
StyleSportsSportsSportsSportsSportsSportsSports
MovementQuartz (Battery Powered)Quartz (Battery Powered)Quartz (Battery Powered)Quartz (Battery Powered)Quartz (Battery Powered)Quartz (Battery Powered)Quartz (Battery Powered)
Band MaterialRubber / SiliconeRubber / SiliconeRubber / SiliconeRubber / Silicone—Rubber / SiliconeRubber / Silicone

About this product

  • Rugged & Sporty Design – Matte black finish with bold digital display, built for tactical, military, and extreme sports enthusiasts.
  • High-Brightness LED Backlight – Features Super Illuminator LED with a light guide plate, ensuring exceptional visibility in low-light conditions.
  • 200M Water Resistance – Engineered for swimming, snorkeling, and outdoor adventures, this shock-resistant watch is ready for action.
  • Extended 7-Year Battery Life – Powered by a CR2025 battery, offering years of reliable performance without frequent replacements.
  • Shock-Resistant Structure – Built to withstand extreme conditions, making it ideal for sports, military, and rugged outdoor use.

Specifications

Brand
Casio
Model
GD100-1B
Gender
Mens
Brand
Casio
Style
Sports
Display
Digital (Screen)
Case Diameter
51 mm
Band
Rubber / Silicone
Features
GMT / Dual Time Zone, Luminous Hands & Markers
Water Resistance
Diving (200M & Up)
Dial Color
Black
Movement
Quartz (Battery Powered)
Width
1 inches
Height
1 inches
Depth
1 inches
Weight
0.15625 pounds
Colour
Multi
Warranty
1 Year Manufacturer
Released
2023-05-19T00:00:01Z
Part number
GD100-1B
Manufacturer
Casio
GTIN
00079767925109