I don't think I would put a quilt in a front loader that is an antique. Even though it is getting tumbled, that is still a lot of stress on the older fabric and seams.
In a top loader, you soak it, let the water drain and then spin the water out, repeat to rinse, not letting it agitate or for only a minute or so. You don't have this kind of control with a front loader :D:D:D