Welcome back to the Forum.
Maltese silver of this period carries the makers mark and also a single letter that denotes one of the three silver standards permitted at this time, the standard was divided into 12ths and as follows:-
"F" (French Silver) 11 1/2 parts Silver to 1/2 part alloy
"R" (Roman Silver) 11 parts Silver to 1 part alloy
"M" (Maltese Silver) 10 1/2 parts Silver to 1 1/2 parts alloy
Not sure of the maker, hopefully someone else can identify him.
I'll move the topic to the Provincial & Colonial Marks section to see if we have any luck there.