Seiko Cal. 5644 - 378

Seiko 5644-378

The 5644-378 is a sought-after Quartz piece from Seiko's golden era. Powered by the 5644 caliber with 31j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-2ca6c8c6cb32]

Also known as: Bullhead, Silverwave

Specifications

Movement
Quartz
Case Material
Gold-Plated
Case Width
35mm
Case Thickness
12.1mm
Lug Width
21mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
150m
Dial Color
Cream
Jewels
31j
Frequency
21,600 bph
Power Reserve
42 hours
Year
1980

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