I have used Goo Be Gone successfully on a couple of older quilts. I put it on and let it dissolve the glue. I do it very slowly and then wash on the gentle cycle of my washing machine then hang to dry. One of the tops was made in 1946 and the blocks had not been sewn together yet. The other was sewn together and was much more difficult. I can't tell you when this top was made. What ever you do be very careful and consult the owner.