I don't recognize these marks , but I do think your spoon is circa 1830's or 40's - by the shape/style and the shell motif - I'm
thinking it is European because of the number of marks - American silver normally displays the makers mark and a silver standard ,
(sterling /coin) It clearly isn't English - the marks don't conform to their system at all . Keep us posted - Nice Find !
I'm guessing this may be Scandinavian ...