Mexican Sterling Silver Bead "Pearls" Necklace

Vintage Mexican sterling silver "pearl" bead necklace. Beads were hand made in halves and the holes were punched from the inside out and then the halves were soldered together. They are graduated in size from 7mm to 13mm. One bead has a small dent and one has a solder hole where it was heated too much when it was made. It is 19" long. Hallmarked on the non-locking clasp. Beads are on chain and there is a gap in the back where the chain has stretched over time. Weight: 32.6 grams. In the photos with 5 strands, this is the one in the middle.