This is a Yamaha 448G. It has a large bore lead pipe (important for mouthpiece size) and an F Attachment. This trombone has no aftermarket parts.

This trombone has been used for High School Marching band, so it has been dented lightly and scratched often, but the playability is near perfect and the trigger has no issues. All tuning slides move, the trigger moves smoothly, and the slide glides, provided you keep up with maintenance.