Can't help with your query but just wanted to add that I absolutely loved this film as a kid and I've been looking for a copy myself for years. When you consider some of the rubbish that has made it to DVD into those bargain bins, I can't believe that this film has been overlooked.
It has some big names in it too, Robert Vaughan, George Peppard and the guy who plays John Boy in the Waltons (yeah ok clutching at straws on that one!)
Brilliant film and surely due for a proper DVD release or a reshowing on tv sometime soon.