I am 99% sure on the Philipson and William Ford connection.However I can not find any Wm Ford trademark, far less one similiar to yours. I have a few bits of correspondence from people who shared Ford's Price Street premises but nothing from the Ford outfit.The late Geoffrey Boothroyd spoke to me a long time ago about trying to list and illustrate all the trade marks that were known but I don't think anything came of it.He did show trade marks in at least one book, can't recall which one and all my Boothroyd stuff has been passed on.