The dimensions given by the seller ( 6/12", roughly 165 mm and 9 1/2", roughly 242 mm) are very close to the dimensions given in Ricke's Swedish Glass Factories. It's hard to tell definitively if the engraving is the same as in Ricke but it looks very, very similar. I know it should be LG 231, but is it possible that the "O" is either a mistake or a badly made "G"?
My interest, which I'll confess, is that a friend was thinking of bidding on this, and asked if I thought it was genuine. I told him I thought there was a good chance it was genuine. He didn't bid, btw, which allowed Msiscoe to get it at a very good price. I'd buy it at twice that price, and more.