Antique celluloid cameo style brooch.  The silver tone frame holds the cameo in with 4 metal prongs.  The prongs are punched out from the backside.  The cameo is white on a black base.  The catch is a simple C.  It’s an oldie but goodie in nice vintage condition.  1 3/4” x 1 3/8.”  

Thanks for looking!  As always, from a smoke free home.