My wife discovered that way in the back of one of our closets were volumes 3, 4, 5, and 6 of the Factory manuals for 911 from 1972 on.
Still in the box from the factory.
I purchased them roughly 27 years ago from the local dealership and intended them as a gift for my mechanic, a childhood friend. Turned out that he already had all the Porsche manuals.....
What are they worth?