Knowing your trombone's serial number can help you identify the year your instrument was made. YAMAHA Trombone YSL-620 … I hope to add to and continually update this list - please do let me know if you spot any errors or omissions. Designed with the budget-conscious band director in mind, this new professional bass trombone has a smaller bell size that offers excellent tone for the advancing bass trombonist. It is possible to increase the pitch even as you extend the slide, Orchestra pieces in which the trombone plays an important role. Price: $8,699.00 RRP. The 1.10 series Knowing your trombone's serial number can help you identify the year your instrument was made. H. N. White Co. -- King Serial Number