Seiko Cal. 5631 - 233

The Seiko 5631-233 represents an important milestone in Seiko's 1987 lineup. Powered by the 5631 caliber with 17j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-94859b3446de]

Also known as: Bullhead, World Timer

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

110m

Dial Color

Navy

Jewels

17j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1987

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