I was given what seems to be a vintage, but very nice, Frontalini Accordion. It is Mother of Pearl and seems to be playable. I am wondering what type of accordion it is so I can start figuring out how to play it, and maybe estimate its age. The only identification that I see on it are the Frontalini name, made in Italy, and the numbers 384/17 which I guess to be a model number. Any help is appreciated .