Seiko Cal. 5641 - 737

This Solar model from 1975 features a 43mm Two-Tone case. Powered by the 5641 caliber with 20j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-460533cbdeb1]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

43mm

Case Thickness

11.8mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Navy

Jewels

20j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1975

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