Seiko Cal. 6637 - 372

The Seiko 6637-372 represents an important milestone in Seiko's 1972 lineup. With its 20mm lug width and 9.0mm profile, it sits comfortably on most wrists. [seikata-wm-a19bdd7f8e19]

Also known as: Shogun, Emperor

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

39mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Cream

Jewels

26j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1972

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