Seiko Cal. 5631 - 388

Seiko 5631-388

This Hand-Winding model from 1977 features a 43mm Titanium case. The Bidirectional bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-18b9caaa3486]

Also known as: Bellmatic

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
43mm
Case Thickness
9.8mm
Lug Width
20mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
40m
Dial Color
Black
Jewels
30j
Frequency
28,800 bph
Power Reserve
61 hours
Year
1977

Related Models

seikata-wm-18b9caaa3486