First to reply to an earlier post where you said:
How do you know the sepia-colored Mays wasn't released sometime in 1952 with the other B&W cards in the set? Where is actual evidence that shows the sepia-colored Mays being a 1953? Since you're the "professional", this shouldn't be a hard question to answer.
The simple answer is you can't print a sheet of all B&W cards and have ONE of the cards be sepia. Each sheet is printed the same way. Be it sepia or B&W. All cards on that sheet will be the same
Your "B&W" above is not B&W. I can point out tons of examples of different tints of sepia. These could be different print runs, how far into a print run the sheet was printed as ink was running low and the big difference is when the same sepia card was issued (printed) in different years.
Below is an example of what I am talking about. Four different tint Mantles with the same Made in U.S.A. we are talking about. B&W bottom right.
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