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: January 1988?
Other known printings:
June 24, 1989
January 21, 1990
2nd edition published June 12, 2015 (with circular Cynicalman rubber stamp in the top left corner)
Other known printings of the 2nd edition:
October 8, 2020