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White resin G-Shock with round analogue-digital dial and resin strap

CASIO

CASIO GA100B-7A watch 200m water resistance 51.20mm case

SKU CH-G9XB-M8VRZ MPN GA100B-7A

Sports watch with analog-digital display, 200 m water resistance and a 51.20 mm resin case

  • Watch movementQuartz
  • Product shapeRound
  • Dial markingsIndex
  • Display typeAnalog Digital
  • Date displayDate
  • Strap materialResin
  • 200 m water resistance protects the watch during swimming or diving
  • 20 mm resin case gives a bold presence on the wrist
  • Analogue-digital display with index markers shows time and date at a glance
  • Quartz movement keeps accurate time without winding
  • Buckle clasp secures the resin band for active use

Built for Sports and Daily Wear

The Casio G-Shock GA100B-7A is a quartz sports watch designed for adult men who need a durable timepiece for active use. Its resin case and band handle knocks and moisture without adding bulk. The analogue-digital display shows the time, day and date at a glance. This model suits anyone who wants a single watch for training, outdoor work and everyday wear.

Water Resistance and Case Profile

The watch is rated to 200m water resistance, so it survives swimming, snorkelling and heavy rain without issue. A fixed bezel and mineral crystal protect the dial from scratches and impacts. The resin construction keeps the 51.20mm case light on the wrist while maintaining the structural toughness the G-Shock line has delivered since 1983. A buckle clasp secures the strap during vigorous movement.

Upgrade from Basic Digital Watches

Buyers replacing a simple plastic digital watch gain shock-resistant construction, 200m water resistance and a combined analogue-digital readout. The jump is worth it when you need a single watch that survives daily abuse and still looks presentable enough for casual settings. It is not for buyers who want more storage, builders who need a second card, or anyone requiring smartwatch notifications, heart-rate tracking or GPS logging.

How it compares

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

Price $115.99
Typical for this category: the median of 2,679 items is $130.99.

Specifications

Product
Brand nameCasio G Shock
Model nameGA100B-7A
Design styleSports
Item conditionNew
Display
Display typeAnalog Digital
Size & build
Main materialResin
Product shapeRound
Strap materialResin
Closure typeBuckle Clasp
Bezel typeFixed Bezel
Housing materialResin
Case size51.2 mm
Watch glassMineral Crystal
Environment & compliance
Water resistance200m
More details
Watch movementQuartz
Dial markingsIndex
Date displayDate
Suitable forMale
Age groupAdult

Questions about this item

How do I set the analog hands and digital display on the GA100B-7A, and which step do people skip?

Pull the crown to the second click to enter hand-setting mode, use the lower buttons to match the digital time, then push the crown back in; skipping the crown push-in leaves the hands uncoupled from the quartz movement.

What part of the GA100B-7A will need replacement first with daily wear?

The mineral crystal resists scratches but can chip on hard impact, while the resin case and band may degrade from UV and sweat after several years; the crystal is usually the first component that requires service.

What is the practical depth limit for the 200 m water-resistant GA100B-7A during sustained swimming?

The 200 m rating covers surface swimming and snorkelling; sustained pressure at depth, rapid temperature changes or operating buttons underwater can exceed the seal design, so treat 20 m as the working limit for continuous use.

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