width can vary too. I have one that's AB narrow but not AB and not trimmed. And I've seen wide ABs.
The variance is probably from the equipment of the time, and the method of cutting. I suspect some of the cutting machines were worn or simply not setup well, making size differences and diamond cuts common.
Procedure can make a differnce as well. A sheet of say 50 cards, 5x10(Just an example, not the actual sheet size) can be cut at first either into strips of 5 or 10, or into two sheets of 25. strips of 5 would be a little hard to handle for the next cuts, removing single cards from the strip. And strips of 10 would be worse. Making blocks of 25 would make handling easier. Modern equipment has a bed big enough to handle the whole sheet, so it's not that big a deal. The cutters they had may have had less space.
Steve B
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