List of Costume Jewelry Marks - Dr. Lori Ph.D. Antiques Appraiser
Does anyone recognize this maker's mark? It's on the back of a vintage brooch. | Collectors Weekly
Designer Costume Jewelry Marks — Astor Galleries
Hallmarks and History of Vintage, Contemporary, Modernist and European Costume Jewelry Designers- Research and Information Page: Amazing Adornments.com