Seiko Cal. 6640 - 470

Seiko 6640-470

This Spring Drive model from 1966 features a 38mm Titanium case. The Bidirectional bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-c58d155d1b66]

Also known as: Monster, Bellmatic

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
38mm
Case Thickness
11.0mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Bidirectional
Water Resistance
190m
Dial Color
Black
Jewels
27j
Frequency
36,000 bph
Power Reserve
42 hours
Year
1966

Related Models

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