The on-sale date is the date of publication reported for the issue in Daniel Clowes' copyright registrations for "The Laffin' Spittin' Man" and the issue's installment of "Like a Velvet Glove Cast in Iron."
Notes:
Fred Altegott given credit for help with this strip, which is a pastiche of the Jack Chick published religious tracts and cameos some characters from them.