Vintage art deco CORO RARE duette brooch pin ruby red estate antique 30's

Absolutely BEAUTIFUL! This was patent by Gaston Candas of New York and Italy, and released to coro to produce in 3-31-1931 This is a VERY rare piece, I can't find another one exactly like it anywhere online at all, Signed on back with patent number and some other numbers etc but they did not sign it Coro, BUT IT IS 1000%. I've looked up the pat. info. This was worn on a hat, scarf or as a brooch pin, it's a duette style brooch, and I believe it's made on pot metal. It has 4 beautiful ruby red Rhinestones then the rest are clear rhinestones. Some yellowing with age of course. This still is beautiful and sparkles and shimmers! Photos look worse than it does in person. measures- 2.95" box 22 I sell in my closet and have tons of other brands similar to list such as weiss, Stanley Hagler, Alice caviness, Demario, Navajo, James Avery, miriam haskell, Jomaz, hattie Carnegie, juliana, Lee sands, Barse, native American, coro, vior,Donald stannard, lisner, renoir, Eisenberg, Christian dior,Givenchy, ciner, carolee's, hobe, Ben amun, Tiffany and co, Vendome, Alexis bittar, Judith jack, kjl, vargas, Sherman, Nolan Miller, Elsa peretti sharra Pagano, Jill Fagin, Jay feinberg, kenneth Jay lane, Germany, Japan, Hong Kong, Simon ju, Thelma deutsch, Erwin pearl, monet, Napier, Cynthia Daniel, Judith McCann, hollycraft, Joan rivers, Elizabeth Taylor, Anne klein, Oscar de la Renta, Moschino, roule and co, julia Vaughn, jose and maria, les Bernard, Heidi daus, silpada, Sorrell,