Baron - Mr Red
14613
Simple
For me, the top of my list is one that I am happy to wait for patiently until it is absolutely right. The perfect 5512.
Being Rolex-centric, I have built my collection around certain themes. Many of those themes are close to closed. But as a collection, the big hole I have is on what many would consider the iconic pair of 5512 and 5513. I own neither yet both are almost intrinsic to my collection. So for me, a perfect 5512 is the aim. The beauty is, I am in no desperate hurry to find it. I will happily wait until the one that is destined for me arrives. Almost certainly, I will buy other watches before the 5512 arrives. But that is what makes it such a delicious target.
Another hole in my collection is a vintage Milgauss. A 1019 would also be a major target in Rolex world.
Outside of Rolex, where would I begin!!!