Seiko Cal. 5644 - 407

Seiko 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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