B.C.‘s foot in the panel with the speech balloon, and the hatching on the rock in that panel, are the only differences I see between panels, if you don’t count that speech balloon, some printing in other panels, and the signature in the last one. Are there other subtle differences?
In 1966, copying panels wouldn’t have been doable with a computer. Photocopier, followed by literal cut and paste? Or do one master copy and trace it in each panel, adding that little difference in one of them.
Mick & Mason Mastroianni
Parker and Hart