Seiko Cal. 5666 - 646

This Spring Drive model from 1966 features a 43mm Titanium case. Powered by the 5666 caliber with 19j jewels beating at 28,800 bph, it delivers a 56 hours power reserve. [seikata-wm-db576d39d8ec]

Also known as: Sportsmatic, Crown

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

12.2mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Green

Jewels

19j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1966

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