Seiko Cal. 6640 - 770

Seiko 6640-770

This Quartz model from 1967 features a 44mm Stainless Steel case. With its 18mm lug width and 12.1mm profile, it sits comfortably on most wrists. [seikata-wm-a17d6866de4a]

Also known as: Turtle, Bullhead

Specifications

Movement
Quartz
Case Material
Stainless Steel
Case Width
44mm
Case Thickness
12.1mm
Lug Width
18mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
180m
Dial Color
Champagne
Jewels
26j
Frequency
21,600 bph
Power Reserve
57 hours
Year
1967

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