I am going by the info in the book, which says that round ones are MH.
But I've had a particular fondness for this piece since I got it - before the book came out, I have always believed it to be by him - the book only confirmed my opinion.
But it isn't signed, I have no solid proof it is his work. But I adore it.
I've tracked down my other two - but the light is not good enough to take pics just now.