Rosenthal Ivory Germany "Santa Rosa" China Set

45 Piece Set of Rosenthal Ivory Germany "Santa Rosa" pattern.  Purchased at an auction 20 years ago.  I would appreciate any historical information in addition to an appraisal.  All pieces in excellent condition, unless otherwise noted.

7 dinner plates

8 salad plates

8 bread & butter plates

8 flat cream soup bowls with saucers (one bowl's handle is broken off, but I have the pieces)

8 demitasse cups with saucers

1 round covered vegetable bowl (rim of bowl with large chip)

1 14" oval serving platter

1 9" round serving platter with handles

1 10" oval vegetable bowl

1 gravy boat with attached underplate

1 13" octagonal serving platter (broken into two intact pieces)