Seiko Cal. 4431 - 635

The Seiko 4431-635 represents an important milestone in Seiko's 1966 lineup. Powered by the 4431 caliber with 24j jewels beating at 36,000 bph, it delivers a 67 hours power reserve. [seikata-wm-fe852c8d480f]

Also known as: Pogue, World Timer

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

14.8mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

24j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1966

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