Seiko Cal. 5640 - 741

The 5640-741 is a sought-after Solar piece from Seiko's golden era. Powered by the 5640 caliber with 28j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-fd3ba9d34594]

Also known as: Sumo

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

15.7mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

170m

Dial Color

Cream

Jewels

28j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1988

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