Well I never knew that the advertisements, books, key chains, masks, paint chips, that I got on Ebay would be worth anything, but now I am a believer. If you haven't already, check out all the "stuff" available for Opels on Ebay. There is just about anything you could ever want, but the price have gone through the roof. I have a 1971 and a 1970 shop manual, owners manual from every year and all kinds of key chains, and advertisements. I got them many years ago, when things were cheap. I am sure some of the old timers here probably have more than I do, but it's still fun. Can't afford anything now.