Here's a link for a flip-flop track threaded/freewheel hub I believe to be a BH, which is very similar to Nick March's hub. The hub has no identify ing marks. I picked this up a while ago, and always figured it was a BH as that's what it looked like to me. I figured I'd list it in case anybo dy has any further clue what this might be.
http://www.flickr.com/
Nick Brunner
Brooklyn, NY, U.S.