Seiko Cal. 5640 - 234

This Spring Drive model from 1979 features a 43mm Titanium case. Powered by the 5640 caliber with 36j jewels beating at 28,800 bph, it delivers a 53 hours power reserve. [seikata-wm-f4df8d1c0c9c]

Also known as: Sumo, Shogun

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

11.6mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

70m

Dial Color

Silver

Jewels

36j

Frequency

28,800 bph

Power Reserve

53 hours

Year

1979

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