Thanks, JT, for confirming the piece count.

Small sets of relatively modern china such as this are typically not sold at auction because they bring so little money.
The following recent sales and online offerings have been used to research the fair-market value of your china:
https://www.invaluable.com/auction-lot/noritake-ivory-china-simplicity-cf64647b02
https://www.liveauctioneers.com/item/54073095_26-pieces-of-chinaware-by-noritake
https://www.invaluable.com/auction-lot/noritake-golden-simplicity-cups-and-saucers-for-cb1c0338d6

Based on the photographs and information provided, and subject to examination, this is:
A partial 26-piece Noritake "ivory" china dinner service
Simplicity silver pattern #7533, with Morimura 'M' mark
Comprising: 8 dinner plates, 8 luncheon plates, 8 salad or dessert plates, an oval platter and a rounded elongated bowl.
PROVENANCE: from client's mother's estate
$30-50 (represents a fair-market value for auction purposes; asking or retail price may vary).

Please let us know if you have additional items to appraise, and thank you for using Mearto.