Seiko Cal. 4443 - 687

This Automatic model from 1979 features a 35mm Hardlex-Coated Steel case. Powered by the 4443 caliber with 24j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-a636590f055b]

Also known as: Tuna, Sportsmatic

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

15.1mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

100m

Dial Color

White

Jewels

24j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1979

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