Sorry, but I have to differ with you, old buddy.
Sure, the lettering "
CAIRO MONOPOL" on my T80 is darker than the usual T206 brown LENOX color.
However, the brown color of the lettering:
"
Cigarettes
MILITARY SERIES
ASSORTED SUBJECTS"
Is very similar to the color of the T206 brown LENOX cards.
Furthermore, as we know....the inks used in the Jan - Mar 1911 press runs of the last stages of T206 production vary in intensity (from light to dark).
Namely the BLUE ink of PIEDMONT 460 Factory 42 cards and UZIT cards......and, also the BROWN ink used on T80 cards.

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TED Z
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