If you can draw the makers mark, you might have better luck if you do a reverse image search with a black-and-white drawing than with a photograph. But... having just a logo with no letters and no information about the country of origin (you have posted all possibly identifying marks, right?) it's going to be a tough search. Here's another place to scrub... I think their trademarks are mostly more current though, and I suspect they're limited to trademarks currently or relatively recently registered in the U.S.