Seiko Cal. 3847 - 256

This Spring Drive model from 1978 features a 34mm Hardlex-Coated Steel case. Powered by the 3847 caliber with 19j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-e8f95bcc1986]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

12.9mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

Champagne

Jewels

19j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1978

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