There are two editions, both believed to be indistinguishable from each other.
See also:
SRUCC: Skull Comics #1, 3rd edition
SRUCC: Skull Comics #2, 1st edition
SRUCC: Skull Comics #2, 6th edition
SRUCC: Skull Comics #3, 1st edition
SRUCC: Skull Comics #3, 5th edition
SRUCC: Skull Comics #4
SRUCC: Skull Comics #5
SRUCC: Skull Comics #5, Australian Pirate edition
Comixjoint: Skull Comics Series
Comixjoint: Skull Comics #6
Grand Comics Database: Skull #6
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