Antique or Vintage Chinese Porcelain Plates?

by Jody
(Chicago, IL, USA)

I am interested in learning as much as possible about these plates including where and how they were made, who made them, when they were made, for whom they were made, and what they are worth. They have what appear to be three Chinese(?) characters on the back. They are approximately 6" in diameter. They depict rows of robed men radiating out from the center of the plate to the edge. They were a gift from a friend a decade or so ago. She purchased them at an antique store in Indiana, USA. Thank you!