Seiko Cal. 5638 - 166

This Spring Drive model from 1985 features a 39mm Gold-Plated case. With its 19mm lug width and 10.6mm profile, it sits comfortably on most wrists. [seikata-wm-ca57b534e8e2]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

10.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1985

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