Seiko Cal. 6690 - 658

Seiko 6690-658

This Spring Drive model from 1973 features a 41mm Two-Tone case. With its 19mm lug width and 13.5mm profile, it sits comfortably on most wrists. [seikata-wm-dba0a0b5afc5]

Also known as: Tuna, Silverwave

Specifications

Movement
Spring Drive
Case Material
Two-Tone
Case Width
41mm
Case Thickness
13.5mm
Lug Width
19mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
110m
Dial Color
Green
Jewels
20j
Frequency
21,600 bph
Power Reserve
46 hours
Year
1973

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