Seiko Cal. 5641 - 397

This Spring Drive model from 1969 features a 41mm PVD Black case. Powered by the 5641 caliber with 35j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-f6b1bc83b66c]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

12.5mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

170m

Dial Color

Black

Jewels

35j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1969

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