Seiko Cal. 6640 - 106

This Spring Drive model from 1972 features a 39mm Stainless Steel case. With its 18mm lug width and 8.1mm profile, it sits comfortably on most wrists. [seikata-wm-423a26c5e4f7]

Also known as: Shogun

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

8.1mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Silver

Jewels

18j

Frequency

28,800 bph

Power Reserve

61 hours

Year

1972

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