Limoges Royal Commemorative Plate; Princess Grace and Prince Rainer

4$ for any Grace Kelly memorabilia is worth it to me! It looks like their portraits are silk screen, from what I've read these royal commemoratives (for Grace and Rainer) were made mostly in the 60's. Looks like it could be 22KT gold painted edges, but no markings, so who knows. I didn't think Limoges used silk screen, but the mark seems authentic. I don't know if I'd categorize this as a mystery, but any input on it is very welcome!