These posts remind me I need to ask these general questions - 1) how do we know the difference between slit As and Bs when looking at any given 11x12 half sheet? 2) When initially printed, slits A and B of any series were attached down the middle, forming essentially a single 22x12 full sheet with a wide white "gutter" down the middle, and they were cut vertically along this "gutter" and fed individually into a cutting machine?
Thanks - I've started compiling my own collection of sheet images and these answers, particularly about which is A and which is B will help. I have 3 half-sheets from 1978, and each is clearly marked along one of the vertical margins "slit A" or "slit B", but it seems that in many cases this information is not present on sample sheets or images we have of older sheets.
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