HOLTON TR100 Trombone with dedicated case (rare item). Bore 500 (12.7mm narrow bore), 8-inch rose brass bell, nickel silver slide (brass crook). This model is from around 1975-76. Although there is some lacquer degradation due to age, it has been used infrequently, and there are no noticeable dents. The slide moves smoothly, making it ready for immediate use.