We Give Cash Back Stamps Sign

I have 2 large sign for "We Give Cash Back Stamps". They are both around 2 ft tall and very heavy. They are both double sided and with each side being the same BUT both signs are different. You will notice the differences with the scalloping around the edges. (pictures are front and back of each sign)

I can not find anything related to these but would guess something similar to Green Stamps? I have had these for 40+ years.