Seiko Cal. 6631 - 750

This Hand-Winding model from 1979 features a 35mm Gold-Plated case. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-0887385653ee]

Also known as: Helmet, Rally

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

10.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Navy

Jewels

32j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1979

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