The makers say
King 2103F 3B Trombone
King Legend, 3B model with F attachement, .508" (12.9mm) bore, 8" (203mm) bell, nickel silver outer slides, lacquer finish, 12C mouthpiece, 7553L woodshell case.(Model shown: 2104F)
TREVOR JONES BRASS AND WOODWIND LTD 13 CHRISTMAS STEPS BRISTOL UK BS1 5BS TEL/FAX 0117 9227402