Seiko Cal. 5644 - 407

The Seiko 5644-407 represents an important milestone in Seiko's 1977 lineup. Powered by the 5644 caliber with 17j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-48bc634ee9fb]

Also known as: Sumo, UFO

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.2mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

70m

Dial Color

Champagne

Jewels

17j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1977

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