Seiko Cal. 6638 - 510

Seiko 6638-510

This Spring Drive model from 1965 features a 41mm Hardlex-Coated Steel case. With its 22mm lug width and 15.3mm profile, it sits comfortably on most wrists. [seikata-wm-3b9937f1c9cf]

Specifications

Movement
Spring Drive
Case Material
Hardlex-Coated Steel
Case Width
41mm
Case Thickness
15.3mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Fixed
Water Resistance
150m
Dial Color
White
Jewels
33j
Frequency
36,000 bph
Power Reserve
50 hours
Year
1965

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