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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

  • Watch movementQuartz (Battery)
  • Product shapeSquare
  • Strap materialResin
  • Item conditionNew
  • Case size38 mm
  • Housing materialStainless Steel
  • 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.

How it compares

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

Price $25.99
Cheaper than about 90% of the 2,679 comparable items (median $130.99).

Specifications

Product
Brand nameCASIO
Model nameF91WM-3A
Product colorGreen
Item conditionNew
Size & build
Size or dimensions38 mm
Product shapeSquare
Strap materialResin
Case size38 mm
Housing materialStainless Steel
Environment & compliance
Water resistanceYes
More details
Watch movementQuartz (Battery)
Chronograph functionYes
Suitable forMen's
Age groupAdult
Alarm functionYes

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.

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