Seiko Cal. 5644 - 120

The Seiko 5644-120 represents an important milestone in Seiko's 1983 lineup. Powered by the 5644 caliber with 31j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-21419bd86aa7]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

34mm

Case Thickness

9.8mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

140m

Dial Color

Black

Jewels

31j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1983

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