This is an antique porcelain ring holder by Rosenthal. It is marked RC with a crown and crossed swords, Sanssoucl, Bavaria. The mark is green and dates to roughly 1891-1906. The ring holder is 3 1/4" x 3 1/2." It has a delicate floral transfer pattern with gold trim on the actual ring holder portion. It is in excellent condition with no chips or cracks.
Rosenthal China Ring Holder Bavaria RC Crown Mark