Seiko Cal. 5640 - 131

This Solar model from 1987 features a 34mm Stainless Steel case. Powered by the 5640 caliber with 28j jewels beating at 36,000 bph, it delivers a 70 hours power reserve. [seikata-wm-45fc020cd385]

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

34mm

Case Thickness

15.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1987

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