Seiko Cal. 0731 - 318

The Seiko 0731-318 represents an important milestone in Seiko's 1991 lineup. Powered by the 0731 caliber with 21j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-eb569c4b5fa5]

Also known as: UFO, World Timer

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

15.1mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

30m

Dial Color

Champagne

Jewels

21j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1991

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