Seiko Cal. 6630 - 406

This Spring Drive model from 1981 features a 38mm Stainless Steel case. The Inner Rotating bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-8d23b9277d76]

Also known as: Monster, Sumo

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

14.2mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Black

Jewels

26j

Frequency

28,800 bph

Power Reserve

70 hours

Year

1981

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