In correspondence with Dan Adkins Oct 2012 he mailed a letter and among other items enclosed was a photo copy of the published cover for Tales to Astonish (1959 series) #92. He wrote that Don Heck penciled the cover, and he inked, but that he was asked to redrew the Sub-Mariner figure.
“My favorite art by Don Heck. The inks are mine and I was asked to re-draw Subby. This was for my first Marvel story. The new Subby figure, by me has a fist and looks more mad than Don’s Subby. But the power and the mood is in the figure by Don.”