Zenith El-Primero Archived The 7743N is driven by

The 7743N is driven by a Valjoux 7733 manually-wound chronograph unit

With that being said

But beyond that

you simply want an extremely cool vintage watch to wear around town

this is a beautiful example of one of the most fun Speedmaster variants ever produced

Zenith El-Primero Archived The 7743N is driven byZenith, while not a household name, is certainly a known name in the world of watches particularly in collecting circles. The primary reason? The El Primero. The movement was a culmination of a years long research and development process undertaken by Zenith to develop the worlds first automatic chronograph movement. While other brands had sought to achieve the same feat including Heuer (in concert with Breitling and Hamilton) and Seiko Zenith