We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Square green resin digital watch, 38 mm case, stainless steel back

CASIO

CASIO F91WM-3A 38 mm Green Resin Watch

SKU CH-DKX6-4PH7T MPN F91WM-3A

A 38 mm green resin digital watch with stopwatch, alarm, LED backlight and seven-year battery life

  • Size/Dimensions38mm
  • MovementQuartz (Battery)
  • ColorGreen
  • ShapeSquare
  • ChronographYes
  • Band MaterialResin
  • Lightweight daily wear at 21 grams
  • Seven-year battery life from one CR2016
  • 1/100-second stopwatch for precise timing
  • Auto-calendar programmed until 2099
  • Water-resistant for everyday splashes

Classic F-91W Design with Green Resin Case

The Casio F91WM-3A keeps the original square silhouette at 38 mm while introducing a metallic green resin case and matching strap. Quartz movement drives the digital module, and the watch weighs approximately 21 grams for a barely-there feel on the wrist.

Resin Band and Stainless Steel Case Back

A stainless steel case back secures the CR2016 cell rated for a 7-year span, while the resin band fastens with a traditional pin buckle. Water resistance covers everyday splashes and brief immersion, and the LED backlight illuminates the display in low light without extra bulk.

Upgrade from the Standard F-91W

Buyers who want the familiar stopwatch, alarm, hourly signal and auto-calendar to 2099 but prefer a coloured resin finish will find the jump worthwhile. Those needing a metal bracelet, solar charging or multi-band atomic sync should look elsewhere.

Highlights

  • Lightweight daily wear at 21 grams
  • Seven-year battery life from one CR2016
  • 1/100-second stopwatch for precise timing
  • Auto-calendar programmed until 2099
  • Water-resistant for everyday splashes

Specifications

BrandCASIO
ModelF91WM-3A
Size/Dimensions38mm
MovementQuartz (Battery)
ColorGreen
ShapeSquare
ChronographYes
Band MaterialResin
GenderMen's
AgeAdult
ConditionNew
Case Diameter38mm
Case MaterialStainless Steel
Water-ResistantYes
AlarmYes

Questions about this item

Does the 38 mm case and 8.5 mm thickness sit flush under a shirt cuff?

The case measures 38.2 × 35.2 × 8.5 mm and weighs 21 g, so it slips easily under most cuffs without catching.

What strap width and lug layout does the resin band use?

The integrated resin band is moulded to the 38 mm stainless-steel case; no spring bars or separate lugs are involved.

How do I set the auto-calendar so it stays correct until 2099?

In timekeeping mode, hold the adjust button until the digits flash, then step through year, month and day; the calendar then runs automatically to 2099.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.