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Round black-dial analog solar watch with resin case and strap, 58.10 mm thick, 200 m water resistance

CASIO

Casio G-Shock G-Steel GST-B100-1A Solar Watch 200m 58.10mm

SKU CH-KGAR-DYQBE

A solar-powered analog watch with 200 m water resistance and a 58.10 mm resin case

  • Watch movementSolar
  • Product shapeRound
  • Watch face colorBlack
  • Dial markingsIndex
  • Display typeAnalog
  • Date displayDate
  • Solar charging keeps the watch running without battery changes
  • 200 metre water resistance suits swimming and diving
  • Shock-resistant construction protects the movement from impacts
  • Mineral crystal resists everyday scratches on the dial
  • Resin and stainless steel case blends durability with a dress style

Solar-powered G-Steel for daily wear

This Casio G-Shock G-Steel GST-B100-1A runs on Tough Solar power, removing the need for regular battery changes. The resin case and stainless-steel bezel combine light weight with the shock-resistant construction the line is known for. A black analog dial with index markers and a day-date window keeps the face readable at a glance. It is built for men who want a tough, low-maintenance watch that suits both casual and dress settings.

Check strap size and lug width before ordering

The band is resin with a buckle clasp, so verify that the lug width matches any replacement strap you may prefer. Mineral crystal protects the dial, but it scratches more easily than sapphire, so consider a protector if you work around abrasive surfaces. Water resistance is rated to 200 metres, suitable for swimming and surface water sports, though the crown must be fully pushed in before immersion. Ensure the 58.10 mm case thickness fits comfortably under your shirt cuffs.

Fits a minimalist everyday carry

Solar charging frees you from carrying spare batteries or a charging cable on trips. The analog display needs no backlight button, leaving the case profile clean for sliding under sleeves. Shock resistance lets the watch absorb impacts from commuting, site visits or weekend sports without extra bulk. With 200-metre water resistance you can move from shower to pool to open water without swapping accessories.

How it compares

Measured against everything we stock in Analog & Digital Wristwatches, at today’s prices. Recalculated every night.

Price $243.99
Pricier than about 80% of the 2,679 comparable items (median $130.99).

Specifications

Product
Brand nameCASIO
Design styleDress
Watch face colorBlack
Item conditionNew
Display
Display typeAnalog
Size & build
Main materialResin
Product shapeRound
Strap materialResin
Closure typeBuckle Clasp
Housing materialResin
Case size58.1 mm
Watch glassMineral Crystal
Environment & compliance
Water resistance200m
More details
Watch movementSolar
Dial markingsIndex
Date displayDate
Suitable forMale

Questions about this item

What comes in the box with the GST-B100-1A and do I need to buy a strap or charger separately?

The watch includes the resin strap and buckle clasp already fitted, and the Tough Solar movement charges from light so no separate charger is required.

How do I choose between the 200 m water resistance and the 58.10 mm case thickness for my wrist?

The 200 m rating means it is suitable for diving and heavy water exposure, while the 58.10 mm case thickness gives a substantial presence on larger wrists.

What does the 100 in the model reference mean once the watch is on my wrist?

The GST-B100-1A uses a Tough Solar movement that stores enough power to run for months in darkness after a full charge, keeping the analog display and day-date window accurate.

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