Mark shown is that of white ware factory referenced by dealers and collectors as Guérin used circa 1900-1932. This is often referenced as Mark 3 by dealers, as found in The Collector’s Encyclopedia of Limoges Porcelain.
Wm. Guérin & Co. - Limoges, France
Photo Courtesy of www.rubylane.com/shop/theporcelainartoflimoges
This manufacturing company used a number of different marks beginning in 1870, including similar scroll marks without Limoges and France. One variation used from the late 1890s-1932 spelled out Wm. Guérin & Co. Limoges France.