Thanks for the lastest info. The dates are about what I thought. The French attribution makes sense as the cup was found in Louisiana back in the 1960s. How do I upload pics to site?
Regards - Zach
I've identified the maker of your cup as "Theodor Tonnelier" working in Paris after 1798. Go to this page, http://www.925-1000.com/Ffrench_makers_05.html ,
and scroll down until you come to the Tonnelier mark.