Like Neal my main focus is Castello's. Due to Neal, I acquired my first shape 44 ( oval bowl ) and now will add the shape into my searches for more. The shape 55 is the dominant shape for my Castello's with currently 6 housed here.
The one very dangerous thing about collecting Castello pipes is ... that once you think you've got a "complete" set they throw you a curve and come up with something, in your shape, that you must have! Last time I spoke with Greg Pease about his shape 55 collection, I think he was at 22 pipes and all different.
When I was in Cantu I saw at least 3 more interesting variants that Greg would surely want to add.
oldgeezer - Castello shapes are always "evolving". It is ( IMHO ) one of joys of collecting the brand.
Neal - be warned ...... a shape 44 is headed my way ...... It just might be a must add to your collection.
Regards
Michael J. Glukler