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By the way, there is no trace of gum on the backside of my stamp, and neither does it seem to have been stuck in an album! Does that mean the stamp is false?
English is only my first language so I may still make mistakes, especially when posting late at night or before morning coffee.

I added an edit to my post above to spell out the gum only came on the first printing.
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hard white paper used for that
Yes, the footnotes mention the use of special papers and as such, the LO reprint examples mentioned in my first post are a way to get your hands on examples of those papers which might make some stamp issues of the period "special." [Battle stations, battle stations, all hands on deck, prepare for torpedoes, missiles, aircraft, spitballs, and general attacking language...

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