Eggshell Nautilus China set place setting for 12

This set was passed down to me from my Great Grandmother's collection of china. I don't know how old it is but my grandmother and great aunt were only allowed to use this china for exceptional occasions otherwise it was stored in a glass fronted china cupboard. There is a tea pot, creamer, sugar bowl, gravy boat, 12 tea cups with saucers, 12 dinner plates, 12 square shaped plates, 2 large serving bowls, 3 medium serving dishes, 5 serving plates in assorted sizes, 12 medium shaped plates (bread and butter?). All together there are 74 pieces. The sugar bowl and teapot have lids and are in very good condition. Very few of the plates look used.