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Square resin digital watch with green accents and buckle clasp

CASIO

CASIO F-91W-3SDG Sports Digital Watch 37.50 mm 30m

SKU CH-QPJ1-QM77G

A square digital sports watch with 1/100-second stopwatch, daily alarm, auto calendar and 30 m water resistance

  • Watch movementQuartz
  • Product shapeSquare
  • Display typeDigital
  • Date displayDate
  • Strap materialResin
  • Closure typeBuckle Clasp
  • Quartz movement keeps accurate time daily
  • 30 m water resistance handles splashes
  • 1/100 second stopwatch times short intervals
  • Daily alarm reminds you on schedule
  • Micro light illuminates display in darkness

Everyday digital sports watch

The Casio F-91W-3SDG is a lightweight quartz watch with a square resin case and matching strap. A fixed bezel and buckle clasp keep the 37.50 mm profile secure on the wrist. It is built for daily wear and basic timing needs.

Simple strap fit for active use

The resin band fastens with a standard buckle, so no tools are needed to adjust the length. Water resistance to 30 m handles splashes and rain but not swimming. The slim case slides under a cuff without catching.

Steady quartz timing over long periods

The movement runs on a single battery and maintains consistent accuracy day after day. A 1/100 second stopwatch, daily alarm and auto calendar operate without drift. The micro light illuminates the display for quick checks in low light.

How it compares

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

Price $39.99
Cheaper than about 83% of the 2,679 comparable items (median $130.99).

Specifications

Product
Brand nameCASIO
Design styleSports
Item conditionNew
Display
Display typeDigital
Size & build
Product shapeSquare
Strap materialResin
Closure typeBuckle Clasp
Bezel typeFixed Bezel
Case size37.5 mm
Environment & compliance
Water resistance30m
More details
Watch movementQuartz
Date displayDate
Suitable forMale

Questions about this item

How long will the battery last before it needs replacing?

The quartz movement is powered by a standard watch battery that typically lasts several years under normal daily use.

Does the resin case and strap become uncomfortable or sticky during extended wear?

The lightweight resin construction stays cool on the wrist and resists sweat buildup during all-day use.

What strap size or tools are required to adjust the buckle clasp?

The resin strap uses a traditional buckle clasp with pre-punched holes for tool-free adjustment.

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