I am especially in love with the lantern top! Just wonderful!! What treasures you have.
I guess it depends on what area your family comes from, because my ancestors never used plain muslin on the backs of their quilts. They used feed sacks for sure, but they were the print ones, and usually the ugliest ones they had went on the backs. I guess before the print sacks came out they might have used plain ones but I haven't seen any of those.
Also, my people almost exclusively tied their quilts. I guess getting them done and in use was more important than creating something very fancy. We are talking Oklahoma/Arkansas farmers with lots of kids here, and I'm sure that makes a big difference than someone with more leisure on their hands. Smiles and hugs.