Connstellation 3B vs «regular» Conn 3B

[Trombonaparte]

I learned very recently that a Conn 3B isn’t -just- a 3B but came in (at least?) two variants with the “regular” and Connstellation markings. Does anyone have experience with both? I am of course familiar with the lovely relationship between the 3B and Ye Olde Conns (my 72H is in for a mouthpiece-treat this Xmas), but I had no clue prior to this that there where more than one kind of 3B?