Seiko Cal. 6643 - 374

This Hand-Winding model from 1973 features a 45mm Hardlex-Coated Steel case. Powered by the 6643 caliber with 28j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-51e6536f300b]

Also known as: Sportsmatic, Navigator

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

10.2mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

White

Jewels

28j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1973

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