These 13 plates were part of the unsold inventory of a general store in rural Washington state. The store was opened in the 1930s and closed several years ago and I don't have a way to learn when they were made, but most likely it was in the 1950s.
There are seven square snack/luncheon plates with a round slight indentation for a cup, and six rectangular matching relish/salad/dessert/condiment plates. The square plates are 6 3/8" square and the relish plates are 6 3/8" x 4 1/8". All pieces are heavy will add to the cost of shipping (factored into the price).
The era of these plates is mid-century.