Seiko Cal. 5631 - 639

Seiko 5631-639

The 5631-639 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5631 caliber with 32j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-5c52d7492b6d]

Also known as: Emperor

Specifications

Movement
Automatic
Case Material
Titanium
Case Width
36mm
Case Thickness
11.7mm
Lug Width
22mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
180m
Dial Color
Cream
Jewels
32j
Frequency
36,000 bph
Power Reserve
40 hours
Year
1976

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