Seiko Cal. 6640 - 655

Seiko 6640-655

This Quartz model from 1966 features a 42mm Hardlex-Coated Steel case. With its 21mm lug width and 9.6mm profile, it sits comfortably on most wrists. [seikata-wm-20687f38a0d5]

Also known as: Helmet, Bellmatic

Specifications

Movement
Quartz
Case Material
Hardlex-Coated Steel
Case Width
42mm
Case Thickness
9.6mm
Lug Width
21mm
Crystal
Mineral
Bezel
Bidirectional
Water Resistance
200m
Dial Color
Champagne
Jewels
27j
Frequency
28,800 bph
Power Reserve
59 hours
Year
1966

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