It happens, even on proof coins:

Just noticed on the last image, the MD was what I chose it as an image. But note the shadow affect on the left sides of the devices. That is called "flat field doubling". It happens on proof coins what have
Machine Doubling on the first strike. Then the second strike flattens some of the previous strike and added more
Machine Doubling on the second strike. (Just a side thought)
Edited by coop
04/20/2021 10:38 am