Seiko Cal. 5632 - 397

The 5632-397 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5632 caliber with 31j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-5f9b7506181c]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

14.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Black

Jewels

31j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1972

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