Seiko Cal. 5631 - 703

Seiko 5631-703

The 5631-703 is a sought-after Kinetic piece from Seiko's golden era. Powered by the 5631 caliber with 36j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-0c3314ba186f]

Also known as: Monster, Tuna

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
38mm
Case Thickness
8.1mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Rotating
Water Resistance
60m
Dial Color
Burgundy
Jewels
36j
Frequency
36,000 bph
Power Reserve
56 hours
Year
1971

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