I'm not sure about the older presses, but that can actually happen on a modern press if the operator leaves the cylinders turning while adjusting the registration. (or if there's a serious misfeed of the sheets) The plate prints to the blanket but with the paper feed turned off the images just stack. Since it's during setup, it's an uncommon error. The ones that happen from misfeeds are pretty common, and don't show much separation. The ones during setup are more impressive. I've only found one. Somewhere from 5-9 impressions, maybe more. And since it's both the black and magenta, it shows a 2 color press was being used.
Steve B
