Seiko Cal. 6639 - 456

This Spring Drive model from 1980 features a 40mm Stainless Steel case. With its 20mm lug width and 14.7mm profile, it sits comfortably on most wrists. [seikata-wm-5096b2d3c580]

Also known as: Monster, Shogun

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

14.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

Green

Jewels

19j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1980

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