Chinese silver plate Scallop Sea Shell rosary center with red enamel cross on the front. The scallop shell is not only a common symbol for baptism but also has ties to St. James the Greater (one of the 12 apostles). The front of the center features a red enamel Cross of Santiago de Compostela, while the image on the back is most likely of St. James (it also looks like someone performing a baptism, unfortunately my supplier is unable to confirm for me the exact details). Sized at a little over 3/4 inch tall (including rings) and 3/4 inch wide (including rings).
For more information about Saint James the Greater check out these 2 articles:
Priced per center.
Thanks for looking! God Bless and have a great day! :)