from Spectacular Spider-Man (1976 series) #149 (Marvel, April 1989), script by Gerry Conway, pencils and inks by Sal Buscema, colors by Bob Sharen, letters by Rick Parker
Which means we can assign this a date of May 20:
from Amazing Spider-Man #121 (June 1973), script by Gerry Conway, pencils by Gil Kane, inks by John Romita Sr. and Tony Mortellaro, colors by David Hunt, letters by Artie Simek
See how it all fits in together? Comics!