Seiko Cal. 5644 - 609

Seiko 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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