Seiko Cal. 5637 - 631

Seiko 5637-631

The 5637-631 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5637 caliber with 24j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-52eb7388087b]

Also known as: Monster

Specifications

Movement
Hand-Winding
Case Material
Gold-Plated
Case Width
36mm
Case Thickness
13.6mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
120m
Dial Color
Green
Jewels
24j
Frequency
21,600 bph
Power Reserve
37 hours
Year
1968

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seikata-wm-52eb7388087b