Hello, I recently purchased this concertina at a thrift store along with some instruction books. I was wondering if anyone can tell me about it. I'm not sure it's actually a concertina with the holes around the edge. Also wondering if it's not the best one since the bellows seem to be some sort of printed paper vs leather bellows? It looks like it might be kind of old sounds nice when you squeeze it though. Any info would be helpful. Thank you in advance Sam