For sale is: Vintage 1980 LEGO 7720 4.5v Diesel Freight Train 100% Complete Instructions Box.  The flap holding the top section of the box on is partially separated.  The Lego set, according to the owners, is complete, and has been stored in a dry environment in the home over the last 40-50 years.   
Offers will be entertained.  Shipping cost varies depending on where you live (sorry, I have no control of the cost!)