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Green digital G-Shock watch, 51mm round resin case, black rubber strap, large display

CASIO

CASIO GD100-1B Green Digital Watch 51mm 200m

SKU CH-T62K-9DGMG MPN GD100-1B

A 51 mm digital sports watch with shock resistance, high-intensity LED illumination and 200 m water resistance

  • StyleSports
  • MaterialPlastic
  • MovementQuartz
  • ColorGreen
  • ResizableNo
  • AdjustableNo
  • Shock-resistant construction handles heavy daily impacts
  • 200-metre water resistance suits diving and swimming
  • High-intensity LED illuminates the face in darkness
  • Large digital display area gives clear data at a glance
  • 51-millimetre case diameter provides a bold wrist presence

Built for tough daily use

The Casio GD100-1B is a 51mm digital sports watch with a green dial and black resin band. Quartz movement powers a large display area that stays readable in bright light. Shock-resistant construction and 200 metres of water resistance make it suitable for field work, swimming or outdoor training. It is aimed at adults who need a single rugged timepiece that can handle knocks and immersion without extra care.

Runs cool and quiet on a cell

Quartz movement draws negligible power from the internal battery so there is no heat, fan noise or charging routine to manage. The high-intensity LED illuminates the face on demand without a noticeable drain. With 200 metre water resistance the seals stay intact during showers, pool sessions or heavy rain. No winding, no daily charging and no thermal throttling mean the watch simply runs until the cell needs replacement.

Replaces fragile fashion watches

Buyers moving up from dress watches or basic plastic models gain shock resistance, deeper water rating and a display that stays legible at a glance. The step is worth it when daily activity includes impacts, water exposure or low-light reading. It is not for buyers who want more storage, builders who need a second card, or users who require smartphone notifications, heart-rate tracking or GPS logging.

Highlights

  • Shock-resistant construction handles heavy daily impacts
  • 200-metre water resistance suits diving and swimming
  • High-intensity LED illuminates the face in darkness
  • Large digital display area gives clear data at a glance
  • 51-millimetre case diameter provides a bold wrist presence

Specifications

BrandCASIO
ModelGD100-1B
StyleSports
MaterialPlastic
MovementQuartz
ColorGreen
ResizableNo
AdjustableNo
ShapeRound
Dial ColorGreen
DisplayDigital
DateDate
ChronographChronograph
Band MaterialRubber
Band Length7
FastenerBuckle
GenderMale
AgeAdult
ConditionNew
Case Diameter51
Case MaterialResin
CrystalHardened Mineral
Water-Resistant200m
AlarmYes
Size/Dimensions51mm wide by 16mm thick

Questions about this item

How do I fit the 51mm case on a smaller wrist when the black resin band is not adjustable?

The 7-inch rubber strap uses a traditional buckle; you fasten it on the hole that matches your wrist and tuck the excess under the keeper loop — no tools or link removal needed.

What part will wear out first and need replacing on this GD100-1B?

The rubber band will degrade from sweat, UV and chlorine exposure long before the quartz module; expect to swap the strap every couple of years for comfort and security.

At what depth does the 200-meter water resistance reach its practical limit during continuous diving?

The 200 m rating covers recreational scuba depths; sustained pressure beyond that or repeated heavy impact on the crown area can compromise the seals first.

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