Platinum Split second Watch no. 7644

Case: Platinum Dial: Movement: Provenance: 1??? - CH Meylan, Brassus 1??? - Tiffany & Co., New York 2009 - Antiquorum, 29 Mar 2009, est CHF8-12,000, unsold, "Tiffany & Co., Platinum Split-Seconds Chronograph C. H. Meylan, Brassus, Swiss, No. 7644. Made for Tiffany & Co., circa 1925. Very fine and rare, thin, keyless, platinum pocket watch with split-seconds chronograph with register. C. Three-body, "demi-bassine?, solid, polished, concealed hinge, co-axial button in the crown for the star/stop/return to zero functions of the chronograph, button at 11 for the split-seconds. Hinged gold cuvette. D. Brushed silver with black champleve dauphine numerals, outer minute track and fifths of a second chronograph divisions with 5-minute Arabic numerals, subsidiary dial for the seconds at 6, for the 30-minute register at 12. Blued steel Breguet hands. M. Cal. 17''', rhodium-plated, fausses cotes decoration, 27 jewels, straight-line lever escapement, cut bimetallic compensation balance adjusted to temperature and six positions, blued steel Breguet balance spring with overcoil, swan-neck micrometer regulator. Dial signed Tiffany & Co., movement signed C.H. Meylan, case numbered. Diam. 47 mm."