Seiko Cal. 3840 - 108

This Spring Drive model from 1974 features a 40mm Stainless Steel case. Powered by the 3840 caliber with 27j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-daadeee798f3]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

70m

Dial Color

Black

Jewels

27j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1974

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