Conn metal clarinet, the serial number is 1794, four segments. The length of the instrument without the mouthpiece is about 23 3/4".  There's a photo of a metal Conn clarinet that's about the same length on the website of the National Music Museum in Vermillion, SD.  The museum says that clarinet is in the key of A.  The clarinet for sale here is not playable.  A friend tested it,she could only get about three notes out of it.  So plan to spend some money on repairs to get it working correctly.  The instrument has finish wear, spots of corrosion and dents.  You can see areas where the finish is worn away, exposing the brass underneath. The connection points of the segments mostly are loose. The cork is worn almost smooth.  If you hold the instrument vertically the bell will slip off.  With some of the other joints you're able to easily turn the parts after they're together.  Not all the keys work smoothly, I found at least one that wants to catch a little when it's depressed.  Comes with a modern soft sided case.  The longest segment of the clarinet won't fit inside the case, so I'll pack it in the outer pocket, wrapped with bubble wrap.  It has a Conn mouthpiece but there's no ligature with it. And the cork on the mouthpiece is mostly gone, someone wrapped string around it as a substitute.