Al Cass

Dizzy Gillespie (2-24A Mostly, though switched to a 2-25A a few times)
Armand Vorce (4 series)
Don Elliott  (not sure what size, just have dimensions in the book)
Louis Armstrong (dizzy backbore and diz tool)
Clark Terry (the Diz model)
Kenny Dorham (custom with Diz backbore)
Booker Little (stock 1-28)
Marion Frazier (custom)
Paul Fishbein (custom)
Don Cherry (Diz cup/custom)
Roy Eldridge (custom, later...Diz tool was used)
Harry James (custom)
Howard McGhee (2-26/2-27)
J.J. Johnson (custom)
Trummy Young (J-1)
Slide Hamton (custom)
Ken Albers (custom)(previous was a Bach 10 1/2 CW)
Bucky Clayton ( X-1 custom)
Doc Cheatham (Diz cup with stock backbore) & 1-28
Emmet Berry (custom with stock backbore)
Sonny Colin (stock piece but which model?)
Joe Newman (2-28)
Snooky Young (Roy's tool/custom)
Thad Jones (1 and 2 series)
Dizzy Reece (various 1 series stock)
Blue Mitchell (stock 1-28)
Grover Mitchell (J-1)
Harry Sweets Edison (Diz cup with Stock backbore)
Red Rodney(1-28/2-28/3x3)
Tony Salvatori ( #5 bass trombone/custom)
Emil Haddad (1 series)
Angelo Pettine (S-1)
Julian Priester (J/custom)
Benny Powell (S-1)
Art Farmer (stock 1-28) Flugel 6
Freddie Hubbard (1-28/1-24/2-24 but settled on the 1-26)
Louie Jasch (1-28 and stock Mellophone)
Curtis Fuller (S1 and bass trombone 3)
Dick Shiutleff (1-28)
Nick Buono (1 series set and 3x3).
Mike Conn (3x4-27 & 3x3)
Rob Turk (3x5A & 2-29)
Nat Atdurbery (custom)
Phillip Guilbean (1-28)
Roy Burrowes (1-28 & 3x2)
Willie Cook 3x3 and 1-28
Chuck Connors (bass trombone #5)
Bernard McKinney Stock J-1
Jesse Drako 3x3
Harry James (custom)
Dizzy Reece (stock with Diz back)
*) Maynard Ferguson (custom 3x6)
Carl Sanders F.H. custom
Dwight Carver? Stock Mellohpone and Alto Horn
John Donnelly 3x4