Seiko Cal. 6381 - 990

The Seiko 6381-990 represents an important milestone in Seiko's 1977 lineup. Powered by the 6381 caliber with 36j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-25adacd718de]

Also known as: Bullhead, Rally

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

38mm

Case Thickness

12.9mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

200m

Dial Color

White

Jewels

36j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1977

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