Seiko Cal. 5691 - 391

The Seiko 5691-391 represents an important milestone in Seiko's 1976 lineup. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-b1add76cd636]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

14.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

White

Jewels

29j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1976

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