Hello, I have a sugar tongs (or coal tongs reference to H. Stierling) with the double makers mark "MF". It is dated 1784 and later 1825. I think it was made in Denmark, but I did not found the mark in the Bøje books.
As very well known, there are a lot of unregistered Danish masters.... Anyway, I dare to guess without any commitment that it could be Mikael Morgensen Fought 1782-1814 in Copenhagen, but as i said, a pure speculation because Fought's mark has some similarities with this mark.