I purchased them from an individual who got them from a close friend, an architect, who found them inside a wall of a building undergoing renovation in Sausalito, CA. This was in the 1960's, and he has had them stored in his barn for the past 40 years. He recently told me he was ready to part with them to raise some cash to work on restoring the barn. He is a retired janitor, and needed the money. -John O'Niell