Welcome, Judicat,
Really interesting pearls, for sure! Great luster and look at their rose overtones! Having an idea of when these pearls might have been purchased, any stories associated with them, as a gift for to mark a special occasion, souvenir of travel, anything like that. Perhaps a rough idea of size, too, length of strand, and some of the center pearls laid next to a ruler.
Definitely a careful washing and restringing is in order, plus adding an updated clasp if you wish. What a treasure!!