Seiko Cal. 4531 - 639

Seiko 4531-639

This Hand-Winding model from 1988 features a 46mm Titanium case. Powered by the 4531 caliber with 32j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-45c3745dcc6e]

Also known as: Sportsmatic, Navigator

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
46mm
Case Thickness
8.4mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
30m
Dial Color
Silver
Jewels
32j
Frequency
36,000 bph
Power Reserve
47 hours
Year
1988

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