Vintage alpaca silver made in Mexico ornate belt buckle

Large silver toned belt buckles with the large black stones. New old stock with some light scratching from storage. Please see photographs as these form part of the description. Weighs approximately 4 oz. Marked on the back with two backwards SS that look like snakes. Made in Mexico. Likely alpaca or nickel silver, did not test as positive for sterling silver by scratch test. However, I am not an expert in testing metals. I proudly use reclaimed and recycled packaging materials whenever possible