In a case like this it might be best to show the whole object as details can help point toward origins and eras. Now, your F could be a partially marked P, and the O could similarly be a C. Personally, I would start the clockwise count from the first leaf, thus giving M.S.P.C., which might read as the M. Silver Plate Company. Oddly enough, Rainwater lists a name that might fit, but this here would not be a mark shown for them. The clover was used by some other makers to boot so it was kind of an up-for-grabs symbol. Again, more photos might reveal something.