i just pulled out my little senns and i don't see a number on them, but they are the ones with the clear and black case that fold up like you describe and the cord wraps around the clear part. i really enjoy them and use them often. i'm a firm believer in senns, also owning the 490s and the ones used by electronic dance dj's. i forget the number on them and they are upstairs.
you really can't go wrong with senns and like you said, you can find them for good prices.