Seiko Cal. 6640 - 928

Seiko 6640-928

This Spring Drive model from 1970 features a 38mm Stainless Steel case. With its 22mm lug width and 14.0mm profile, it sits comfortably on most wrists. [seikata-wm-f53108cfaba4]

Specifications

Movement
Spring Drive
Case Material
Stainless Steel
Case Width
38mm
Case Thickness
14.0mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Fixed
Water Resistance
150m
Dial Color
Green
Jewels
21j
Frequency
28,800 bph
Power Reserve
47 hours
Year
1970

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