Antique French Art Nouveau Silver 800 First Communion Medal Chalice c1909. It has the French hallmark for silver 800 (crab). Engraved on the back "9 Mai 1909" (May 9th 1909) along with the initials "S.C."
The last photo shows a few first communion sterling silver medals that we have for sale, don't forget to take a look at them.
