Seiko Cal. 5631 - 739

Seiko 5631-739

This Automatic model from 1976 features a 36mm Gold-Plated case. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-30c5da375b97]

Also known as: Sumo, Baby Tuna

Specifications

Movement
Automatic
Case Material
Gold-Plated
Case Width
36mm
Case Thickness
10.3mm
Lug Width
18mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
140m
Dial Color
Cream
Jewels
21j
Frequency
28,800 bph
Power Reserve
64 hours
Year
1976

Related Models

seikata-wm-30c5da375b97