Equally credible sources conflict on whether or not Kirby assisted Don Heck with illustrating Larry Lieber's script for the first Iron Man strip in 1963's TALES OF SUSPENSE #39. Sources are unanimous though that Kirby did pencil the second Iron Man tale.

YOU KNOW YOU ARE A KIRBY KONNOISSEUR IF...

 you can explain why the dozen issues of his NEW GODS series were numbered #1, 2, 3, 4, 5, 6, 6, 7, 8, 9, 10, 11.