Seiko Cal. 6278 - 634

This Spring Drive model from 1970 features a 36mm Hardlex-Coated Steel case. Powered by the 6278 caliber with 20j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-8a06133fdf9c]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Black

Jewels

20j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1970

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