Seeing just a picture is hard . I like to touch, feel can tell you a lot about fabric. But in my opinion (an you know what they say about those :-) ...... I would say 60's to about 80's . Simply from the colors and I recognize some of the patterns from when I first started. As far as not finishing it or worrying about mixing fabrics. I say don't . Unless it is museum quality it really doesn't matter all that much in the grand scheme of things. I have one I just finished that has fabric in it from the 1930's to reproductions from today. These kind of quilts were meant to be finished and used. I do have one that I am hunting fabrics from one period but it is a repair job and that is what she wants.