Seiko Cal. 3891 - 978

This Spring Drive model from 1973 features a 38mm Stainless Steel case. Powered by the 3891 caliber with 34j jewels beating at 36,000 bph, it delivers a 37 hours power reserve. [seikata-wm-7e71240214ca]

Also known as: Bellmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

11.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Navy

Jewels

34j

Frequency

36,000 bph

Power Reserve

37 hours

Year

1973

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