Seiko Cal. 5631 - 438

Seiko 5631-438

This Automatic model from 1992 features a 39mm Stainless Steel case. Powered by the 5631 caliber with 17j jewels beating at 36,000 bph, it delivers a 41 hours power reserve. [seikata-wm-4d9a0ee92ddb]

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
39mm
Case Thickness
9.1mm
Lug Width
20mm
Crystal
Mineral
Bezel
Fixed
Water Resistance
180m
Dial Color
Blue Sunburst
Jewels
17j
Frequency
36,000 bph
Power Reserve
41 hours
Year
1992

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