King 2B Liberty late 70's Make SN 686625. King Musical Instruments Engraved on bell. Never damaged or repaired. The slide is fantastic. Overall it looks gorgeous and plays fantastic. This is the model that was designed and popularized by Tommy Dorsey. Is probably the most popular lead horn for jazz band of all time. Would be an ideal lead or solo horn for big band, trad jazz, dance band, commercial style playing. There is a reason why Tommy Dorsey and so many other famous players over the years played this model. Once you start playing it, you know why. Dual Bore Slide Simply means the upper tubes are slightly less in diameter than the lower tubes. You can scream in the upper range on a 2B. King sells the legend series 2B today in the $3000 range. We like the older ones better for the way they play and also the cost savings.