Vintage Mexico Sterling Silver Black Stone Bracelet Cuff ETC9146

This is a vintage Mexico stamped sterling silver cuff bracelet. It is set with 3 large black stones with white stripes running through them. I believe the stone is agate. The squares of agate are 7/8" square. The cuff measures 5" around inside from end to end and 15/16" wide. The gap at back is 1 3/8" wide. Total weight is 49.8 grams. The silver has taken on a dark patina that can be polished off.
This is a vintage, previously owned bracelet. Therefore, light wear can be expected. There is no visible damage.