Mexico Sterling Silver Spiral Conch Shell Brooch or Pendant

Here is a charming vintage sterling silver brooch in a conch shell like spiral form. It is made of sterling silver and is so marked, along with a mark reading MEXICO. Another mark reads A-104. There is a loop on top of the brooch so that it could be worn as a pendant or charm on a necklace. The total weight is 0.7 ounces. The brooch measures 2.25" x 2.25".