It is very pretty. I wouldn't have passed it by, either.
I've found some very lovely quilts in Good Will. It seems that when a "sewist" passes on or becomes unable to care for her/his self, the family disposes of treasures like this. Perhaps they have taken their pick of the treasures before donating the rest of the fabric/project collection; perhaps not.
Moral of the story is to designate who gets what out of your fabric, projects, machines, equipment collections and then ask that the 'unclaimed' items be donated to a local guild or charity that can make excellent use of them.