Stampmaster - This is R153 and you have the upright rectangular periods as illustrated in the 2017 Scott U.S. Specialized, described as occurring in 90 positions in the pane of 100.
Quote: Yep, that's a red I. R. overprint all right.
I don't know about that... could be crimson... or possibly the ultra-rare "ever so slightly darker than fire engine red but with just a smidge more brown in it" shade.
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