Hi Bruno, I own this one. My only modern yellow gold watch ( other than a few antique gold omega dress watches from the 1950 's ) as I prefer white metal ( precious metal and steel ) watches . This 5146 J is stunning in my eyes and on my wrist.In the flesh the yellow gold is less yellow and more pink in hue due to the slate dial when compared the 5146 J with white dial. One other point regarding the desirability of a Patek AC is that , when designing the movement, PP chose to use gears rather than levers and hence the AC movement has more parts than the equivalent PP Perpetual Calendar movement. To me, this PP AC
movement is something significant ( patent awarded in 1996 ) in Pateks history IMHO.