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Sandman #18 Error Edition
DC Comics, August 1990.
Some copies of Sandman #18 are noted as variants or blue panel variants. It appears that the yellow and blue coloring is reversed on the first page giving it 3 blue panels instead of yellow. Very few of these issues are in circulation with CGC showing less than 5 officially graded copies.
CGC label these issues as "Error Version" with the additional text "1st three panels on 1st page are printed in blue ink".