Seiko Cal. 6631 - 700

This Spring Drive model from 1967 features a 36mm Stainless Steel case. With its 19mm lug width and 15.1mm profile, it sits comfortably on most wrists. [seikata-wm-38dbd3930707]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

36mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

23j

Frequency

21,600 bph

Power Reserve

51 hours

Year

1967

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