Seiko Cal. 6646 - 666

This Spring Drive model from 1973 features a 41mm Stainless Steel case. With its 20mm lug width and 13.1mm profile, it sits comfortably on most wrists. [seikata-wm-a5dd0e77130b]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

13.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

White

Jewels

31j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1973

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