Another fantastic find (log cabin in in-laws' basement)! As to its future, my comment would question how you intend to use it. If you want it as a keepsake and put away, leave it as is. If you don't care about preserving its monetary value as vintage, finish it with hand quilting. This way it can be handled and enjoyed. I'm not a great fan of muslin backing unless it is to be a wall-hanging and nobody knows what is on the back. If it will be a lap throw/bed quilt, I like a backing with a pattern or tone-on-tone fabric that makes it pretty on both sides. I'd probably choose a tan/ecru tone-on-tone if I could find one that compliments the quilt top. Love the colors in that one!