Estate Signed Vintage Coro Brooch Unusual floral

Not quite sure what is on the back of the birch besides the brooch pin there’s some kind of something on it and then I am unsure what the little hooks are . Located in container P Vintage, 80s, 90s, 70s, 60s 50s, mcm, modern, contemporary , romantic feminine, gaudy, new wave , mid century Marilyn Monroe , Princess Diana , Elizabeth Taylor, Art Deco, Edwardian , victorian , vntg vtg, Gatsby , iridescent , 20s 30s, 40s , gemstone , crystal, formal , evening , cocktail jewel , chic, classy , classic , bridal , bling sparkle , y2k, 2000s , street style, streetwear unique, testival , party