This is an extremely cool Keilwerth SX90R straight tenor sax, serial number 119772. Keilwerth made a few straight altos over the years, but just a couple straight tenors. This horn is ultra-cool when you see it in person, and is a blast to play. It has all of the features of the SX90R tenors, with rolled tone holes and adjustable palm keys. On display at the Saxquest Museum in St. Louis, MO. If you find yourself in that area, stop in and check this one out!