Seiko Cal. 5631 - 839

Seiko 5631-839

This Hand-Winding model from 1991 features a 36mm Hardlex-Coated Steel case. The Fixed bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-2c263f7dc432]

Also known as: Monster, Helmet

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
36mm
Case Thickness
14.4mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Fixed
Water Resistance
80m
Dial Color
Navy
Jewels
33j
Frequency
28,800 bph
Power Reserve
41 hours
Year
1991

Related Models

seikata-wm-2c263f7dc432