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Anyone got any personal experience with this one? BT could stand for bass tuba:

http://cgi.ebay.com/Miraphone-Jim-Self- ... 25585b84d8" target="_blank

I believe that is one of those "cheater" mouthpieces. I thought he had a bass trombone and euphonium one so I am assuming this is for bass trombone specifically. It looks much shallower than my 30mm "shallow" contrabone mouthpiece. So while I sent the guy a message about it , I think it would probably be better for regular bass trombone parts as opposed to super low-quasi contra parts.
My afore-mentioned contra mp, a JK KBP2C, really works wonderful on my 1062. The low range is phenomenal, my horn is sharp enough so that a bucket won't drive it flat , the sound is wonderful, high range is fine up to F and doable over that,... It rocks at the bottom of the brass choir I play in though I do use a much smaller, shallower mouthpiece (Yamaha 60B) for big band as I have too many tenor parts there! I will probably try the 60B out in my on-the-way Benge 190F too.

I have one of these mouthpieces. I wrote to Miraphone and asked what its specs. were and they did not know. I e-mailed Jim Self and he told me it was a 6½ with a Miraphone C4 rim. This mouthpiece looks like the one I have but, without actually having the two mouthpieces side by side, it would be difficult to say if they were identical mouthpieces.