Seiko Cal. 5631 - 910

Seiko 5631-910

This Hand-Winding model from 1992 features a 38mm PVD Black case. Powered by the 5631 caliber with 31j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-b492c07e809f]

Also known as: Monster, Navigator

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
38mm
Case Thickness
14.1mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
50m
Dial Color
Champagne
Jewels
31j
Frequency
28,800 bph
Power Reserve
45 hours
Year
1992

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seikata-wm-b492c07e809f