Engraved Alpaca Silver Breast Collar Plate

Here is a nice engraved silver plate for a breast collar. Not branded, marked Mexico and appears to be alpaca silver. Has nice engraving work, with gold-tone raised rope edge. Sets with Chicago screws, no screws included. In good used condition, shows age related tarnish which has not been polished.  Measurements: 5 3/8″ wide at top, 4 1/4″ long from center of “Y” to the bottom.