I'm looking to buy my first trumpet or cornet (I'm originally a woodwind player), and there's a woman in my area offering a King cornet for $100. It looks in pretty good shape, but she doesn't know much about it, even the model. I believe it to be a 1975-1980 603, from the SN and the pictures she's given me. Is this worth the price, assuming it plays? A friend and I are going to test it this weekend.