Comix in the E.C. horror tradition.
According to lore, the 1st printing has a black registration mark inside of a red pentagon half-way down the right edge of the back cover.
See also:
SRUCC: Skull Comics #1, 3rd Printing
SRUCC: Skull Comics #2, 1st Printing
SRUCC: Skull Comics #2, 6th Printing
SRUCC: Skull Comics #3, 5th Printing
SRUCC: Skull Comics #4
SRUCC: Skull Comics #5
SRUCC: Skull Comics #5, Australian Pirate Printing
SRUCC: Skull Comics #6
Comixjoint: Skull Comics Series
Comixjoint: Skull Comics #3, 1st Printing
Grand Comics Database: Skull #3
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