I stumbled across this on eBay - I laughed and cried at the same time.
I say cried, only if, and I can't say for sure, the item is the original first issue (lets say it is for arguments sake) ...
... The equivalent in posters would be like painting over a Dr. No US One Sheet.
I suppose it would be worth the restoration for an initial outlay of 50p, but would you really buy it???
DB5 eBay Auction