Seiko Cal. 6637 - 388

The Seiko 6637-388 represents an important milestone in Seiko's 1990 lineup. Powered by the 6637 caliber with 26j jewels beating at 36,000 bph, it delivers a 36 hours power reserve. [seikata-wm-e0994a325818]

Also known as: Bullhead

Specifications

Movement

Kinetic

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

10.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Black

Jewels

26j

Frequency

36,000 bph

Power Reserve

36 hours

Year

1990

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