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Casio

G-Shock GA-100 Series

The Casio G-Shock GA-100 Series is a 51.2 mm, 200 m water-resistant watch with a mineral crystal.

Case
51.2 mm
Water
200 m (656 ft)
Movement
Not published
Thickness
16.9 mm
Casio G-Shock GA-100 SeriesCasio G-Shock GA-100 SeriesCasio G-Shock GA-100 SeriesCasio G-Shock GA-100 SeriesCasio G-Shock GA-100 Series
Casio G-Shock GA-100 Series colors
Photo: Long Island Watch (opens in new tab)

What the data says

  • Lighter than 67% of the 3 other watches we list in the 49–53 mm range.
  • Lowest in-stock price is 24% below list price this week.

Computed from the specs below. How we write summaries.

Full specs

Last verified Oct 5, 2026

Casio’s own site doesn’t allow automated reading, so specs, prices and photos come from Long Island Watch’s product page (longislandwatch.com), a retailer that sells it. Unless marked otherwise, every spec is quoted from that page.

Case
Case diameter51.2 mm
Thickness16.9 mm
Lug to lug55 mm
Weight (manufacturer)0.15 lb (70 g)
CaseResin
CrystalMineral
StrapResin Band
Toughness
Water resistance200 m (656 ft)
Shock resistantYes
Movement & features
DisplayAnalog-digital
Other
ColorwaysBlack and Blue, White, Black and White, Black and Red, Brown
Warranty1 year

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