Munchkin No. 5 - "12 Munchkies" & "Chick-On-Head" Variant Cover by Paul Maybury

Please Be For several issues of Munchkin the publisher had a printing error that left marks on the back cover that appear to be drops of Oil or some other substance. These marks are on every copy and are on all issues, variant covers and all, until at least issue 10. Possibly more.