Here is the one that hung on our grandfather's wall.

In a field of gold, four saber nails placed in the
corners and with their points facing toward the
center of the shield.

(Vicente de Cadenas y Vicent,
"Repertoire of Blazons of the Hispanic Community",
1987, [1966], page 515.)

Here is another one we got from a different source

If you recognize any of these Coats of Arms, or if you have a different one, please contact us.