Hi,I don't know the maker but I trawl through flea markets frequently and funnily enough I'm sure I spent a bit of time looking hard at a piece with this mark on it and deciding to pass,I don't remember it being in the same style and it maybe still there so if I get time I'll go and have another look,if I remember correctly it had a polished Pontil with the mark next too it and I couldn't make my mind up if it was a mark or a slip.