I am not a trumpet player but hope to become one. I bought a trumpet from a friend of a friend. Here is the info engraved on the bell: Stradivarius Model 37 Vincent Bach Elkhart, Ind USA Here is the info engraved on the middle valve: ML 146528 It is silver, rather tarnished, especially on the outsie of the bell. The bell seems like it might be slightly deformed, but it's hard to tell with all the tarnish. There are a couple of rather small dents on the pipe leading to the bell, about halfway back. There are some light scratches just a little ways back from the bell. The 1st, 2nd, and 3rd valve slides come out, but they are a sticky, especially the first. The tuning slide will not budge. I don't want to apply my full strength for fear of damaging something. The valves move nicely - not effortlessly, but not at all sticky. The bottom valve caps do unscrew. The water key works. There are 3 mouthpieces, all Vincent Bach. Two or them are labeled "1 1/2 C". The other is labeled "3". What should I have done to this horn? What should be done so that the tuning slide is slideable? Should I buy another mouthpiece? I am only interested in playing jazz.