One thing I'd like to do is get a list together of all the different manufacturer's prince shapes. I'll start off with the ones I know, please feel free to post additions or correct any that I have wrong.
Dunhill - 407 is the current prince with an additional number representing the pipe group size, i.e. 2407, 3407, 4407, etc. Pre-1976 prince shape designation is FE.
Chacom - model 337p a more traditional prince and model 862 a larger prince, almost apple shaped.
Comoy - model 337
Savinelli - model 313 is the smaller version, group 3, and model 315 is group 4. There's also a 315ex, their largest prince shaped pipe.
Wessex - model 612
Lorenzetti - model 29
Luciano - model 92
Rattray - model 39 and 46
Rossi - model 8315, made by Savinelli, same as their model 315
Ashton - as far as I can tell, they don't have model numbers, they just call it a prince.
Peterson - model 408, almost apple proportions
Nording - no model number, it's just called a prince