Superb estate find. Vintage Conn 30H trombone. Professionally owned and maintained. Excellent cosmetic condition showing only very minor wear and to the original lacquer finish. Serial number seems to suggest 1953 from Conn website.What Conn said in 1950: The Burkle models are popular in in large organizations where great power and volume are paramount. Have [sic] unique tapered bore through bell, tuning slide, bell taper, hand slides and hand slide bow. This design produces big tone, accurate intonation and ease of response, especially in top register, making Burkles favorites of high note kings. Narrow, light slides for fast execution. Two bore sizes: medium, 7-inch bell, 30H; large, 7½-inch bell, 32H. Both with long slide bearing for smooth 7th position, bell lock, slide lock, balancer, tuning in bell.No signs of damage or abuse, much less than normal wear for an instrument of this age. A few minor nicks here and there. Slide is clean and operates very smoothly with no snags etc..  Bell is crisp and clean with no dents, wrinkles or repairs. Original case is in very nice shape with all hinges and latches intact and working fine. Original keys are also in case pocket. No foul odors. Obviously cared for and stored carefully. Very fine example of this vintage Conn model. From what I can gather, my price is very fair. Will ship securely and quickly. Someone will very happy to have this as part of their collection! Thanks for looking. I also have a vintage trombone mouthpiece listed in a separate auction. Check it out!