Found this:
Universal Geneve “Golden Janus” watch, reference 042.400. Limited edition from UG's 100th anniversary in 1994. The outer case is platinum and the inner case is rose gold. Two-faced watch, one side with jumping hour, running blued steel minute hand, day/night indicator, and blued steel pointer date; one side with RG hour and minute hands and four applied RG roman markers. The two sides can keep two different times. UG stainless steel folding buckle with RG clasp. UG caliber 42. Model 120 from a limited production of 150.