Let me tell you what I know about these. They came out of Washington state which makes sense given the Sqincir mold on the Olympic WM chip (as well as the Olympic name). So they are from the Northwest. But what does the WM stand for? How about W. Mills owner of Oakes Lodge in Dayton, OH who also had Sqincir chips??? Notice that the pink chip also has a W on it (most of them also have numerous cigarette burns no them). Maybe Mills retired to Washington??? Does anyone have any ideas? What else could the WM stand for?