Seiko Cal. 5640 - 741

Seiko 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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