Seiko Cal. 6634 - 770

This Spring Drive model from 1988 features a 43mm Stainless Steel case. It features a Cream dial protected by a Hardlex crystal and offers 200m of water resistance. [seikata-wm-2cfe9bfdd18f]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

10.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Cream

Jewels

18j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1988

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