I agree with Pattye. We need to see more and closer up photos. We need the closeups to see more detail.
If the pearls are old, they were restrung. The clasp and cover beads are both exactly what I have been using for the last decade or two, which may indicate that the pearls are from the same time frame. In the early days of cultured freshwater pearls, the shapes were similar to these, though these seem larger than most from the early days of fw culturing.