Patek Philippe Celestial Grand Complications Watch - 6102R-00144 mm 18K rose gold case, sapphire crystal back, Celestial dial with black sapphire crystal disks for sky background and moon phases and transparent sapphire crystal disk for sky chart and Milky Way, caliber 240 LU CL C self winding movement with date by hand, hours and minutes of mean solar time, sky chart, phases and orbit of the moon, time of meridian passage of Sirius and of the moon, approximately 38 48 hours of power reserve, shiny black