Seiko Cal. 4431 - 138

The Seiko 4431-138 represents an important milestone in Seiko's 1986 lineup. Powered by the 4431 caliber with 29j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-7e55c9ec8461]

Also known as: Sportsmatic

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

44mm

Case Thickness

14.1mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

130m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1986

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