You would be better off posting this under the "Main" forum. This forum is about anything related to Vintage Sewing Machines. My opinion, and it is only my opinion, I don't think it is that old. I base that on the darker blue fabrics in the quilt. Especially in the last picture, the fabric on the far right which is showing a blue leaf. Also, the contemporary designs are more contemporary than what was considered contemporary in the 50's. And lastly, unless this quilt was only washed a few times, the turquise and dark blue polka dots would be more faded.
Mind you, I am only playing detective, as I am no expert.