i found this in my recent kilo purchase. i have seen many of these types of stamps but can not recall any of this paper color. could the paper have faded?
While some other stamps in the Americana series are known to have been printed on tinted paper, the 13c Liberty Bell was not printed on tinted paper. However, this stamp is known for faint brown ink smears during the printing process. I've seen many times over the years, but have not seen one so large that it covers an entire stamp so evenly. I've seen smears that cover entire blocks and coil multiples, but usually not so evenly.
Hard to say for sure based on a pic, but I don't think it is toning as the stamp seems to have no other faults associated with improper storage, and the backing paper is still quite clean/white. If the stamp was toned before use as postage, look at the stamp under a magnifier -- you should be able to see some signs of "brittleness" in the paper.
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