patekova
1851
5131R!, although both are fantastic. The virtues of the 5131R have already been stated in this thread. The 5575 stands on its own functionally and aesthetically in a most alluring way.
In bright light, particularly in sunlight, the sky is mesmerizing. And under a loupe, the tiny stars are not shaped as dots, but as actual stars. And the moon is highly realistic and detailed. Plus, it is a limited edition piece which adds to the appeal.
BUT, for me there is one negative and it is not a small one. At night or in a dimly lit room, the dial appears dark and the unique and beautiful details are mostly lost. Also, for me it is difficult to tell the time.
So, yes the 5575 is a great watch, but if I could only have one it would be the hypnotically colorful work of art 5131R!
Best, patekova