That is not a color guide, but the plate number. What you found here is a Plate Number Coil or PNC. If you were to buy a roll of these Christmas stamps at the post office you would find this plate number at regular intervals in the roll This plate number could be found every twelve (12) stamps By the way, the B stands for Bank Note Corporation of America ( BCA ) who printed the stamps
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Posted 07/01/2018 3:32 pm
