Seiko Cal. 6640 - 433

Seiko 6640-433

This Quartz model from 1969 features a 34mm Two-Tone case. The Inner Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-c972082fa157]

Also known as: Tuna, Silverwave

Specifications

Movement
Quartz
Case Material
Two-Tone
Case Width
34mm
Case Thickness
13.7mm
Lug Width
19mm
Crystal
Acrylic
Bezel
Inner Rotating
Water Resistance
160m
Dial Color
Green
Jewels
35j
Frequency
21,600 bph
Power Reserve
44 hours
Year
1969

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seikata-wm-c972082fa157