(14501) An awful lot of  signatures on this little piece!  Although the picture is not clear, you can see how much is written on the back of this.  Names include TONO,  Antonio Pineda and Piedra Necra !
Piedra Necra, Hencho en Mexico Tie Clip, marked PN, Sterling and Tono  -  that has a layer of what appears to be Sterling topped with a brass metal that has a contemporary turn of the century design with Turquoise and onyx inlay. 1 3/4"  $95.00