Seiko Cal. 6640 - 946

Seiko 6640-946

This Automatic model from 1973 features a 41mm Two-Tone case. With its 18mm lug width and 10.0mm profile, it sits comfortably on most wrists. [seikata-wm-fca0868a1fb0]

Also known as: Helmet

Specifications

Movement
Automatic
Case Material
Two-Tone
Case Width
41mm
Case Thickness
10.0mm
Lug Width
18mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
140m
Dial Color
Blue Sunburst
Jewels
26j
Frequency
28,800 bph
Power Reserve
71 hours
Year
1973

Related Models

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