Seiko Cal. 5631 - 540

Seiko 5631-540

This Kinetic model from 1971 features a 35mm Hardlex-Coated Steel case. The Inner Rotating bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-1a249bea7b2c]

Also known as: Monster

Specifications

Movement
Kinetic
Case Material
Hardlex-Coated Steel
Case Width
35mm
Case Thickness
11.2mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
170m
Dial Color
Champagne
Jewels
35j
Frequency
28,800 bph
Power Reserve
56 hours
Year
1971

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