montresmecaniques
The movement is Zenith’s caliber 146 HP. If you’re unfamiliar with the history of this movement, Zenith purchased a company by the name of Martel Watch Company in 1960, and with it obtained their capacity to produce high end chronograph movements. Following the acquisition, Zenith continued to produce these movements until the launch of the famous El Primero automatic movement. The caliber 146 is Zenith’s successor to the movement formerly produced by Martel for Universal Geneve (known as caliber 285). The 246 iteration in my timepiece is designated 146-H, which was the version for a tri-compax chronograph.
Year of manufacture? Sixties! The Cal. 146 is a Martel calibre that was originally found in Universal Geneve chronographs until Zenith bought up Martel in 1960. Previously, they had been using Excelsior Park chronograph calibres. Unlike Breitling and TAG Heuer, Zenith stopped making manual chronographs pretty well as soon as they had the "El Primero" (another Martel production - designed and made after the acquisition) so that the watch is unlikely to be from the seventies. The style doesn't really fit anyway. If you have it opened up and can get a movement serial number, Zenith (info@zenith-watches.com) can tell you more.
I don't think that the watch has a "slang name". The best known pre-EP chronograph with slang name is the "Cairelli" chronograph, which looks a little different and would have that name on the dial (it was made for an Italian watch vendor named A. Cairelli).
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