Seiko Cal. 5631 - 181

Seiko 5631-181

The 5631-181 is a sought-after Solar piece from Seiko's golden era. Powered by the 5631 caliber with 20j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-68ed1748dc87]

Specifications

Movement
Solar
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
10.6mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
40m
Dial Color
Navy
Jewels
20j
Frequency
28,800 bph
Power Reserve
40 hours
Year
1967

Related Models

seikata-wm-68ed1748dc87