I recognize some of the fabric from the '50's. I made my maternity clothes, and I used it then. However, my mother had given me some fabrics, so it would have to have been early '50's. I saved the scraps and used them in a Cathedral Window I made in the early '70's. Anyone trying to date my quilt would have the same problem you are having right now.
As quilters, we just can't throw out any pieces that we feel still has some life in it.
Mldesatnik