Seiko Cal. 6640 - 831

This Hand-Winding model from 1966 features a 35mm PVD Black case. With its 20mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-d6372ef101b4]

Also known as: Rally

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

35mm

Case Thickness

10.5mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Cream

Jewels

17j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1966

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