18k yellow gold case with original shaped lugs. Mechanical movement with manual winding, the 434 drives the two subdials at 3 and 9 o'clock, which include a 30-minute counter, a seconds counter, a "chemin de fer" minute counter with seconds increments, and a thermal scale. The dial appears restored and aged in color, as it was produced in limited numbers between 1941 and 1948. Ref. 4178, serial n. 267998.