Seiko Cal. 6640 - 390

Seiko 6640-390

This Hand-Winding model from 1977 features a 36mm Stainless Steel case. With its 22mm lug width and 15.6mm profile, it sits comfortably on most wrists. [seikata-wm-4b204fdadbb1]

Also known as: Monster, Golden Tuna

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
36mm
Case Thickness
15.6mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Bidirectional
Water Resistance
30m
Dial Color
Black
Jewels
17j
Frequency
21,600 bph
Power Reserve
52 hours
Year
1977

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