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I find the illustrations very interesting. Technically a Patriotic cover is not a first day cover it is a Patriotic cover. Just possibly it might be a Commemorative cover. But the descriptions aren't normally interchangeable if you think about it.
Not sure what your point is here. These
are "first day covers." but the envelopes used are WW II patriotic envelopes.
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An aside: US Airmail FDC collectors will recognize that the large CDS cancellation for this issue was available only with a full pane applied. But even those that used a single stamp and received an ordinary Mar 18, 1943 postmark are "first day covers," just "UO" -- "unofficial." Whether it is an FDC or not has nothing to do with the cachet or lack thereof.
If that was not clear (because I referred to the "envelopes" as "covers"), I apologize.
But if that is the distinction you are making, does it really make a difference? APS defines a "cover" as "An envelope with a stamp or other means of postage payment." By that definition, how are these not "patriotic covers?" I have always thought of a "patriotic cover" as a cover with a patriotic cachet (e.g. such as cataloged in Sherman's catalog). By that definition, these are "patriotic covers" that were used to secure a "first day of issue" postmark for the C25a US airmail stamp. Is that any clearer?
I must have been unartful in my terminology, but I am not sure you made clear how.
Basil