Duplex by Mikasa. Designed by Ben Seibel for Mikasa in the 1970's, the Duplex pattern has big and bold sunflowers in yellow and green. It's a large salad plate measuring 7.75" and has an interesting raised 1" rim making them quite deep. 

Width: 7 3/4 in
Ironstone
Made In Japan
Dishwasher Safe
Discontinued Piece
Piece Code: SP

Minor chips on each plates. SEE PICTURES