Seiko Cal. 6637 - 496

This Spring Drive model from 1989 features a 36mm Gold-Plated case. With its 18mm lug width and 15.9mm profile, it sits comfortably on most wrists. [seikata-wm-f6d9085cbf13]

Also known as: Tuna, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

15.9mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1989

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