I know I have seen quite a few E101/E102 cards with markings, the ones I remember were on the top center border, sometimes just a vertical red mark, sometimes a longer horizontal dash, sometimes a cross hatch.
I have one only one blank back in my prewar collection that wasn't due to back damage or plain old skinning, and it happens to be...McLean, just like the one Brian showed. Because of the shared design, it could be from E90-1, E92, E101 or E105.
Brian
Last edited by brianp-beme; 03-28-2024 at 10:00 PM.
Reason: changed the oopsie daisy on set availability
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