🇲🇽💜Vintage Abalone Daisy Earrings- 696 $25 or $20 w/offer

These vintage abalone daisy earrings are of amazing quality but have no markings on the back. I got them at an antique store and thought they would be Alpaca Mexico earrings but these earrings are definitely not costume. The metal is high quality and non magnetic. I get the impression that they are Taxco brand sterling silver earrings but are not marked.