The folks at Heritage Auctions have, as they usually do, copies of Amazing Spider-Man #1 from 1963 up for bid. It's been called to my attention that when they list one of these, they always say, "Steve Ditko cover (Jack Kirby layouts) and art." Not that it's a huge deal but I think this is wrong. Ditko, of course, drew the insides but I'm pretty sure the cover is Kirby and Ditko, not Ditko working over Kirby layouts. I stand by my oft-made statement that once Jack was no longer working in the Simon-Kirby studio, I don't think he ever laid out a cover for anyone else. He pencilled hundreds that others inked, and sometimes his covers were significantly revised by others. But I know of no case where he laid out a cover and then someone else pencilled over his layout.