button with multiscale enamel dial retailed by Coli Bologna Model: Single Botton Chronograph Material: 18ct yellow gold Year: circa 1930 Case N°: 380819 Caliber: manual winding Movement N°: 17710 Bracelet: leather strap Dimensions: 35 mm Signed: case,dial and mouvement Ulysse Nardin is one of the most renowned watch manufacturers among collectors for its elegance and ability to create unique mechanisms. This monopusher chronograph is a unique piece due to the set of features that make it up. The beautiful 35 mm yellow-gold case with snap-on back and olive-shaped buttons at 2 o’clock is provided with a white enamel dial that is really difficult to create. The dial is decorated with a tachymetric and telemetric double scale, Breguet-style numbers and the rare Coli Bologna signature, official retailer of Emilia-Romagna, Italy.