Beautiful Taxco Abalone Sterling Silver Ring

This is a gorgeous Taxco abalone sterling ring.  It is in very good condition, it is out of round on the band area.  The ring is marked, I am only able to make out the eagle with a 3 in the center.  The other marks are obscure.  The front measures 1 3/8" x 1 3/4" and it is approx. size 7 1/4.