Seiko Cal. 6646 - 674

This Spring Drive model from 1979 features a 43mm Hardlex-Coated Steel case. Powered by the 6646 caliber with 21j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-0bf02e899637]

Also known as: Sportsmatic, Arnie

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

14.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Burgundy

Jewels

21j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1979

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