Seiko Cal. 0731 - 991

The Seiko 0731-991 represents an important milestone in Seiko's 1992 lineup. It features a Green dial protected by a Sapphire crystal and offers 180m of water resistance. [seikata-wm-150a4800da4c]

Also known as: Sportsmatic, World Timer

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

37mm

Case Thickness

15.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Green

Jewels

25j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1992

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