On ebay by Andrew Wildman himself, is the original cover artwork for #74 of the original US Marvel comic series (the one with the Disciples of Unicron attacking Optimus and Scorponok).

http://cgi.ebay.com/ws/eBayISAPI.dll...m=170403125715

It's already at 200pounds (about AU$400).
With Wildman listing it, at least you know it should be the real thing.