RE: Black Billiard. Well, this is interesting. The pipe, when I took it apart to inspect, expecting to blow through the components as I have learned to do to inspect a pipe for hidden cracks and flaws (I have found flaws this way that the experts missed with estate pipes), had at the end of the tenon (is that the right word?) a curious metal pin that looked rather like a old-fashioned wooden clothes pin, the kind with a ball at the end. After a call to SP to ask what the heck it was, she explained that it was a "stinger," designed to circulate air and make for a cooler smoke. Well, it does impede air flow a bit, but not seriously, but I'm still breaking the pipe in, and I'll know better in a few days. I did note, however, that with the pin removed (easily done--just grab it and pull), the air draw is easier and the pipe smokes very well. The lady at SP said she didn't know the pipe had a stinger, and would inform the upper management people that they would update their description of this pipe to mention the stinger.
By the way, I sometimes am unclear on the some components of pipes, so watch for a thread requesting information about this: I plan on doing a drawing of a universal pipe's anatomy for PM users.