Seiko Cal. 5631 - 559

The 5631-559 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 5631 caliber with 26j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-30bf4ab77d24]

Also known as: Sumo

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

40mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

160m

Dial Color

White

Jewels

26j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1965

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