Seiko Cal. 6691 - 420

This Spring Drive model from 1977 features a 38mm Hardlex-Coated Steel case. Powered by the 6691 caliber with 24j jewels beating at 36,000 bph, it delivers a 48 hours power reserve. [seikata-wm-8bfa66bd3263]

Also known as: Helmet, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

13.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Burgundy

Jewels

24j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1977

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