Rare Vintage Zenith/Universal Genève Compax Chronograph, Ref. 22510, Cal. 156, Tri-Register, Cream Patina Dial from 1940sTo understand what this watch is, you need to understand the relationship between two of Switzerland's greatest watchmaking houses. In the 1930s and 1940s, Universal Genve and Zenith relationship extended to shared model names, with both houses using the Compax and Compur names for their chronographs. Universal Genve not only supplied the bauches but also designed the cases, and serial numbers from the Universal archives were assigned to models