This is an approximate guide to deciphering the meaning of the numbers and letters used to create the model numbers used on Yamaha Trumpets. They do not publish their serial number lists like other companies. Regardless of your trombone's manufacturer, the serial number should be located on the piece of metal where the slide attaches to the rest of the instrument (Reference 2). Less well known is the Custom Bb Cornet built in 1990 for Japanese trumpet artist Terumasa Hino. The first Minerva (#2722) was built in 1958. I hope to add to and continually update this list - please do let me know if you spot any errors or omissions. H. N. White Co. -- King Serial Number