Here are some thoughts:
-This appears to be a coffee spoon (you don’t give length) from Bordeaux, mid- late eighteenth C. They are called “cuiller à café boule” and are characteristic of Bordeaux. It would be helpful if you could show the attachment of the stem to the bowl on the reverse side to rule out another period and place altogether.
-I think I see the charge mark of a script B in rope, used 1780-1789 (shown upside down), and just above it the shell discharge mark for the same time period.
-I don’t know who the maker JC or JG is.
-The crowned B would be that of the maison commune.
-Have no idea what the erased mark after the crowned B might be.
Not having references for Bordeaux makers, these thoughts could all be shown to be dead wrong.
Hope this helps a bit.