Seiko Cal. 6640 - 771

Seiko 6640-771

This Hand-Winding model from 1986 features a 43mm PVD Black case. With its 22mm lug width and 13.2mm profile, it sits comfortably on most wrists. [seikata-wm-f50ec2c996a2]

Also known as: Sumo, Golden Tuna

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
43mm
Case Thickness
13.2mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
90m
Dial Color
Cream
Jewels
22j
Frequency
28,800 bph
Power Reserve
36 hours
Year
1986

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