This pair of 925 sterling silver earrings are probably from Mexico however the stamp is impossible to decipher. It was applied before the screwbacks were attached and have been marred by the process.
The earrings are 3/4 inch discs of sterling silver with inlay of abalone. The design could be Aztec or Zuni but definitely from that part of the world. They have screw backs that may not be sterling. Both earring and screw are marked. I just can't read it.
Condition is excellent vintage.