Lovely quilt! Haven't seen anything like it before. The feed sacks are older than the quilt (as you already know). Beyond that, I don't know. Hand pieced? Hand stitched? Much wear? I suppose people may have hung quilts in the past, or were the hangers added more recently? Same fabric, stitching, etc.? Is the batting thin (like we use nowadays) or thicker (as was used in the past)? I see there are stains/yellowing. These may be some clues, but not heavily weighted ones. You may want to take it to a Historical Society, or antique dealer, they may be able to help for little/no cost. Did the guy you bought the treadle from have any idea on its story?