This issue has variants.
The on-sale date reflects the publication date as reported in the U. S. Copyright Office filing. It matches the shipping date listed in Direct Currents #2, February 1988.
Comic has been through 14 printings. Most can be identified by the color of the lettering on the title and cufflink.
cover price for following is 3.50 USD
1st printing is neon green
2nd printing is pink
cover price for following is 4.95 USD
3rd printing is dark yellow
4th printing is light orange
5th printing is dark blue
6th printing is dark orange
7th printing is light yellow
8th printing is light blue
9th printing is red
10th printing is yellow and cufflink is dark yellow
11th printing is yellow and cufflink is dark yellow
12th printing is yellow and cufflink is light yellow
cover price for following is 5.95 USD and there is an "!" after the word "SMILE"
13th printing is yellow and cufflink is white
14th printing is dark green and cufflink is white
The endpapers (which include credits and publishing information) are close ups of the raindrops from the first and last panel of the story. Story tells a comprehensive origin of the Joker based on the story "The Man Behind the Red Hood" from Detective Comics (DC, 1937 series) #168. This story is still considered controversial over two decades after its publication, mostly due to the crippling of Barbara Gordon (which was not revealed to be permanent until subsequent issues of Suicide Squad where she first appeared as the wheelchair bound Oracle), but there is a clear indication that creators Moore and Bolland originally intended this to be a non-continuity "final" Batman vs. Joker story when Bolland strongly insinuates in the afterward printed in Batman: The Killing Joke Special Edition (DC, 2008 series) #[nn] that Batman kills the Joker "off camera" in the last three panels of the story.