The 2552, the final ( I think ) link in my 12-600 collection I have written in the past about the different themes in my collection I have written about the Rolex Prince and also the rectangular Pateks with the 9-90 movement. I am going to cover the next
Here is some info from Antiquorum regarding the 12-600 and the 2526 as well as the later and apparently rarer 3428. I have also included a picture of mine. Ref. 2526. First launched by Patek Philippe in 1953, this was the first self-winding wrist-watchmod