Recently I acquired a quite rare Rolex timepiece: A Rolex Datejust 1601/9 made completely in whitegold. This watch dates to 1972 based on the serial number, but was sold in 1979 in Hongkong.
From outside, you can barely distinguish that this is not a steel model. However, when you look closely, you see that the whitegold has already gathered patina, a kind of yellowish patina.
The endlinks are designed completely differently and have nothing in common with the 55 endlinks.
The clasp is different as well as you can see on the photos below.
Noone really knows how rare this watch is, what I do know is that this has to be the rarest Datejust reference, and possibly belongs to one of the rarest Rolexes.
For the rest, I will let pictures speak.