Seiko Cal. 4431 - 931

The Seiko 4431-931 represents an important milestone in Seiko's 1990 lineup. Powered by the 4431 caliber with 23j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-b408b7d552e4]

Also known as: World Timer, Navigator

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

8.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Burgundy

Jewels

23j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1990

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