I have included several photos of an item I have had in my possession for around 20 years. It is a Wizard of Oz cardboard theater playset. I have not been able to find another like it. Through research of the publisher Grolier and Robert B. Clarke I have only been able to narrow down the manufacturing date to 1976 to 1978 as that is the time frame that Mr. Clarke was president of that company. Any other info or value estimates that any one can pass along would be greatly appreciated. The one I have is far from complete and in decent condition(except for the outside of the box). There is a list of contents so I know how incomplete it is and could determine a value if I at least had a starting point. Thank you for any help.
