I'm very new to the world of concertinas and to begin I bought this Italian anglo (I believe, correct me if I'm wrong) for $67 just to start. Now out of the box, it sounds fine, the only issues are the buttons. Most are sagging but that isn't the real issue. 2 keys, one on each side, are stuck inside the panel. Now before I tinker with this instrument and open it up I want some information from people more experienced than I. Also, would it be helpful to know the brand? I can't find anything on this instrument of when it was made or who made it. Another worrying thing is a rotate the instrument there seems things are loose in it, like particles of something. Making it sound a bit like a Maraca