Vintage Single Strand Clear Faceted Crystal Necklace on Chain 17"

Faceted clear crystal bead necklace 17". The beads combine graduated faceted teardrop beads separated with bicones surrounding a faceted round bead in the center. The beads are strung on a delicate chain which makes me believe this is an older piece, possibly from the 40s or before. the clasp and chain are discolored from age, but all the beads are intact. I could not find any markings.