Does anyone have information on this vintage plate?

I purchased this vintage decorative plate last week at a thrift shop. Over the last couple of days I have been trying to find information on this plate. Here is what I know: it's a dark brown plate with iris flowers, on the back the markings read, RCB, C with a circle around it, and 1956 Irene Smith. I would like to know the history of this piece. Whether is a collector's piece? What it's worth? I already found some information on Norman and Irene Smith from Lawley Alabama. . but I would like to know more.

Any information would be greatly appreciated,

Thanks,

Maria