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Gilbert MainesBoth coins and stamps are collected like that. I have seen a set of many variations of the same date and mintmark large cent, 1793-1820 or so. The variations there were the different dies which were used (all hand tooled, therefore all slightly different).
More similar to cards tho was a collection of the color variations of a single stamp. The one I saw had less than a dozen different hues.
I wonder if I am alone here, or if anyone else finds this type of variation collecting interesting.