Hello
Agree that your liqueur or cordial cups are 19th C French 950 standard silver.
See:
https://www.925-1000.com/Ffrench_marks.html
If you can give us the first letter of the maker’s mark, we might be able to find the maker. Of the 4 cups, there might be one that is more clearly marked.
@QrtS: A maker’s mark is not absolutely required on French 19th C silver, only the silver standard mark. Manufacturers would mark silver objects with the standard, and supply other makers or retailers who may or may not add a maker’s mark. Some well-known examples are Odiot who sub-contracted out most of their silver flatware production to Jean Granvigne, and Christofle who sub-contracted out all their
950 standard silver production to Cardeilhac.
Good luck in your research.
Regards.