Seiko Cal. 5631 - 443

The Seiko 5631-443 represents an important milestone in Seiko's 1986 lineup. Powered by the 5631 caliber with 24j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-c8e22d85c538]

Also known as: Bullhead, World Timer

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.8mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Blue Sunburst

Jewels

24j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1986

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