Paul Smith Giant Man and Wasp vs. Hulk

Well, guess who I bought this from. Truth is, I'd been coveting this baby for a few years and finally bit the bullet, and I may have finally satisfied by Paul Smith jones(Smith? Jones?) in the process. I'd be interested if anyone knew the story behind this piece...I suppose it's likeliest a commission, but it looks like Smitty left space for indicia at the bottom of the page so I wonder if it's an un-published (or published, for all I know) splash...?