Seiko Cal. 5644 - 609

The Seiko 5644-609 represents an important milestone in Seiko's 1981 lineup. Powered by the 5644 caliber with 17j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-9611bb81d8df]

Also known as: Sumo, Shogun

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

15.6mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

40m

Dial Color

Black

Jewels

17j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1981

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