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The Chip Board Archive 19

NCR Stamp Plate Block Question NCR

I'm going through some old US plate blocks (300+ of them) in a box and found ten with the same number. Six of them seem to be the upper left corner. How does this work? Don't they print them like serial numbers or are there larger pages from a web press, all with the same serial numbers. I believe this is Scotts #1187

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NCR Stamp Plate Block Question NCR
Re: NCR Stamp Plate Block Question NCR
Re: They are not serial numbers, they are.........
Re: They are not serial numbers, they are.........

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