Hello Gardoni.
I'm not an expert in French silver either. Just wanted to add some information.
Believe the crowned A mark was used with both small and large works.
Your crowned "V" mark (Maison commune) was used on small items from July 12, 1760 to July 15, 1761.
The letter under the crown for large items would have been in script form.
The shell discharge mark was used from October 1756 to November 1762.
Everything looks correct to me for authentic French marks.
Sorry, can't find who used that maker's mark.
Here's some pictures from my books to show how drawings of the crowned A mark sometimes differ:
Pat.