Seiko Cal. 6640 - 923

Seiko 6640-923

The Seiko 6640-923 represents an important milestone in Seiko's 1983 lineup. With its 20mm lug width and 9.2mm profile, it sits comfortably on most wrists. [seikata-wm-dcd17572f389]

Also known as: Sportsmatic, World Timer

Specifications

Movement
Spring Drive
Case Material
Two-Tone
Case Width
46mm
Case Thickness
9.2mm
Lug Width
20mm
Crystal
Hardlex
Bezel
Inner Rotating
Water Resistance
50m
Dial Color
Blue Sunburst
Jewels
25j
Frequency
21,600 bph
Power Reserve
58 hours
Year
1983

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