Seiko Cal. 6640 - 609

This Spring Drive model from 1967 features a 39mm Gold-Plated case. With its 19mm lug width and 15.1mm profile, it sits comfortably on most wrists. [seikata-wm-89ffb526b2b4]

Also known as: Navigator, Crown

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

39mm

Case Thickness

15.1mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Silver

Jewels

36j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1967

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