Usually that number can be found on the handbrace of the bellsection, the braces of the slide or the slide itself.Ĭonn trombones usually are only engraved on the outer slide. In most cases there is a serial number engraved in the trombone. The easiest and usually most precise way is to look for the serial number. I am regularly being asked how to find out when a trombone was made.
