Platinum Watch no. Unknown

Case: Platinum Dial: Silvered, subsidiary dials for seconds, day & month and outer date track, aperture for moon phase, blued steel Breguet hands, arabic numerals, signed "Haas Neveux & Co., Geneva". Movement: Nickel, bi-metallic balance with blued balance spring with polished steel kidney piece, 18j Provenance: 19?? - Haas Neveux, Geneva 19?? - Duke of Windsor 19?? - Duchess of Windsor 1987 - Sotheby's "The Jewels of the Duchess of Windsor", 3 April 1987, Lot 248 est chf1,200-1,800 "A platinum open-faced keyless calendar watch, the watch with days of the week, months and phases of the moon, movement by Haas Neveux & Co., Geneva, lacking glass", not illustrated. 2010 - Sotheby's "Duchess of Windsor" sale 30 Nov 2010 est $2-3,000 sold $25,000 "THE PLATINUM OPEN-FACED TRIPLE CALENDAR KEYLESS LEVER WATCH, WITH MOON-PHASES, HAAS NEVEUX & CO., CIRCA 1925 The circular silvered dial with Arabic numerals and blued steel Breguet hands, subsidiary dials for day, month, constant seconds combined with moon-phases, outer track calibrated for date, gold date hand, platinum case with snap back, manual wind movement, 18 jewels, case and dial signed Haas Neveux & Co., Geneva, movement numbered, diameter approximately 45mm. Haas Neveux & Cie., Geneva, is one of the oldest watch manufacturers in Switzerland. While they devoted a great deal of attention to the style of their watches, they also always remained at the forefront of the construction of high-precision movements. In 1896 they produced a manually wound calibre that was only 2 millimetres high and in 1914 Haas Neveux won a Grand Prix at the National Exhibition in Berne for its elegant watches for men and women."