Patek Philippe for Tiffany & Co., New York. A fine and very rare 18K rose gold early keyless open face lever watch with moon phases
No. 38,380, made in 1870.
Gilt bar pattern movement jeweled to the third wheel, polished straight line lever with asymmetric counterpoise, bimetallic balance with flat spring and index regulator, wolf's tooth winding wheels, moon phase display driven by a wheel of 24 teeth secured to the hour wheel through an intermediate wheel of 48 fitted with steel finger that engages the 59 tooth moon disc once per day to give 29 ½ day moon period, pendant setting by means of Philippe's improved system, gold cuvette , white enamel dial with arabic chapters, subsidiary seconds, aperture for moon phase at noon, within a polished gold case engraved with elaborate japonesque monogram, case and dial signed by retailer.