Sylvia very pretty, and has nice taste in watches. My problem with Thor is he would consider tasting the watches (actually he might just swallow one whole). Nice to see some Cartier love here too! That's a beauty. I'm guessing you tried the GP forum (I believe there is one on TZ or Puristspro). I am far from a GP expert, but it seems many watches from 1940s, 1950s and 1960s, (PP, AP, VC) just went by reference numbers. Companies often did not have collections they way they do today, for example today VC has the Patrimony, Historique, and Overseas, etc. Often times a watch back then may have been made for a very short span of time, a change or two is made, and there is a new reference number (although they probably used the same movement, until a new one was released). I doubt you will find much specific information regarding your GP, but it really is a beautiful watch. Enjoy it.