[Trombone-l] king mp's ????

[Emil Orth]

Hey guys,  O.K., I'm totally ashamed to have to ask this  at my ripe age of 80, buuuttttt I've been a King 3B player all during my pro player life...about 60 somthing years.  I have always tooted a bach 7C cause it felt so good and gave me the full range all the way up to high D.  My question is:  what size is a King M 21 and a King 11 MP.  I hear others talking and make reference to these sizes and how wonderfully they can sound in the king horns.  I've never been able to find a comparison chart of King MPs to any others out there...and, do they still produce them????.  Anybody out there know all about the King MP line???  Would love to know more! Thanks,, Emil