If the mark is not an under glaze mark,, then it is probably either a retailer or an importers mark !! I did not find any record of it so i am betting a retailers mark !! Was a common practice for retail stores to order items with their own mark !! Many major department stores still do this !! Possible it was made in the Limoges area of France but no records exist of stores that purchased from the studios there that I know of !!