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Posted By: David

I just looked them up, and the E120s are probably photoengravings (releif), which should make them easy to authenticate from the front images.

If they used during printing, different stocks, this may account for the toning differences. Different paper or cardboard, even if having similar initial appearances, can age differently because of their chemical makeup differencees. Obviously, others will be able to tell you how often the toning varies if this is a common trait