Seiko Cal. 6639 - 154

The Seiko 6639-154 represents an important milestone in Seiko's 1975 lineup. With its 21mm lug width and 15.7mm profile, it sits comfortably on most wrists. [seikata-wm-4ef12fb756ce]

Also known as: Shogun, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

44mm

Case Thickness

15.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

190m

Dial Color

Champagne

Jewels

21j

Frequency

28,800 bph

Power Reserve

43 hours

Year

1975

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