The original artwork for this cover is up on eBay right now, along with a Suicidal Syd illustration from a Christmas Viz.
The Oink! cover is full colour on Bristol Board, and comes complete with the acetate overlay which has the logo attached, and the tissue paper overlay giving instructions to the printer. Production methods that are no longer used in our age of Photoshop and Illustrator! (See the link below for more photographs.)
If you're interested in bidding, point your trotters towards this link:
http://www.ebay.co.uk/sch/graphite47/m.html?_nkw=&_armrs=1&_from=&_ipg=&_trksid=p3686
All bids are much appreciated. Good luck!