Platinum & diamond Chronometer no. Unknown

Case: Platinum & diamond set, shutter revealing the dial Dial: Roman numerals, signed "Cartier" Movement: 18 jewels, bi-metallic compensation balance, Geneva seal Provenance: 19?? - Haas Neveux, Geneve 2009 - Sotheby's, 20 Oct 2009, est $5- 7,000, sold $16,250, "Haas Neveux A RARE PLATINUM DIAMOND-SET WATCH WITH CONCEALED GUILLOTINE DIAL CIRCA 1920, * movement stamped twice with the seal of Geneva, 18 jewels, bi-metallic compensation balance * silvered dial concealed beneath guillotine-style shutters * slim case, push-button for shutters at 6 o'clock, diamond-set band and pendant, monogrammed case * dial signed Cartier, case signed HNC, case and movement numbered * total diamond weight approximately 1.66 cts diameter 45 mm"