Cameos by the Checkered Demon, Mr. Natural and Trashman. Includes a two-page spoof of Harvey Pekar's American Splendor.
Generally speaking, Not Available printings beyond the 1st have a datestamp on the front or back cover which is the printing date of the batch that copy was from. Matt Feazell says those post-1st printings were usually 60 copies or fewer.
1st printing: July 1990 (Not Available Comics)
Other known printings:
August 1, 1990