Thanks for the response. A further communication says that it has just one row of buttons. The only flutinas I've seen had a row of pearly keys (usually wobbly and some missing!). Were there other sorts, Bob? I meant to add that I don't yet know if it's diatonic or chromatic, I've asked the owner and she's going to send a photo, I'll put it on a web page when I get it...
Jo