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Octagonal matte black carbon case with analog-digital dial and resin strap

CASIO

CASIO GA-2100-1A2 G-Shock Analog-Digital Watch Black

SKU CH-RGH2-AKW1A

Carbon-cased analog-digital sports watch with 200 m water resistance and hand-shift feature for clear digital viewing

  • Watch movementQuartz
  • Product shapeRound
  • Watch face colorBlack
  • Dial markingsIndex
  • Display typeAnalog and Digital
  • Date displayDate
  • 200 m water resistance suits serious swimming and diving
  • Carbon core guard structure keeps the 45.40 mm case light yet tough
  • Hand shift feature clears the dial for easy digital reading
  • Dual analog-digital display shows 12/24-hour time plus day and date
  • Phosphorescent hands stay visible in low-light conditions

Octagonal Carbon Case

The Casio GA-2100-1A2 G-Shock is a men's sports watch built with a carbon case and resin strap. Its round dial combines analog hands with a digital display for dual-format timekeeping. The 45.40 mm case thickness gives a substantial wrist presence without excess bulk. This model suits wearers who want a durable everyday watch with a distinctive octagonal profile.

200m Water Resistance and Quartz Movement

The mineral crystal protects the black dial with index markers and day-date window. Quartz movement drives both the analog hands and digital readout for reliable accuracy. Water resistance to 200 metres supports swimming and surface water sports. The fixed bezel and buckle clasp keep the watch secure during active use.

Hand Shift Feature and Phosphorescent Hands

The hand shift function moves the analog hands away from the digital display for clear reading of 12 or 24-hour format data. Hour and minute hands use phosphorescent paint for visibility in low light. Digital functions show hour, minute, second, month, date and PM indicator. These features serve users who need quick access to both analog and digital information.

How it compares

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

Price $60.99
Cheaper than about 72% of the 2,679 comparable items (median $130.99).

Specifications

Product
Brand nameCASIO
Design styleSports
Watch face colorBlack
Item conditionNew
Display
Display typeAnalog and Digital
Size & build
Main materialCarbon
Product shapeRound
Strap materialResin
Closure typeBuckle Clasp
Bezel typeFixed Bezel
Housing materialCarbon
Case size45.4 mm
Watch glassMineral Crystal
Environment & compliance
Water resistance200m
More details
Watch movementQuartz
Dial markingsIndex
Date displayDate
Suitable forMale

Questions about this item

How do I set the analog hands and digital display on the GA-2100-1A2, and what step is often missed?

Use the crown to set the analog time and the digital buttons for the digital section; the hand shift feature must be activated first so the hands move away from the digital display, a step many users skip.

What parts of the GA-2100-1A2 will need replacement over time?

The resin strap and buckle clasp will wear with daily use, the mineral crystal can scratch and may need polishing or replacement, and the quartz movement will eventually require a battery change by a watchmaker.

What is the first limit reached during continuous water exposure with the GA-2100-1A2?

The 200 m water-resistance rating is the limiting factor; it is suitable for swimming and surface water sports but not for scuba diving or high-pressure water jets.

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