Seiko Cal. 5638 - 464

Seiko 5638-464

This Spring Drive model from 1991 features a 45mm Hardlex-Coated Steel case. With its 22mm lug width and 13.2mm profile, it sits comfortably on most wrists. [seikata-wm-571fe466895b]

Also known as: Sportsmatic, Navigator

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
45mm
Case Thickness
13.2mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
100m
Dial Color
Burgundy
Jewels
25j
Frequency
36,000 bph
Power Reserve
63 hours
Year
1991

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