I would lean toward stationery, too, but in this design and value, the envelopes that I've seen were red, and the cards that I've seen were blue, so... something else?
I don't have access to Higgins to confirm that the colors I've seen are the only colors, but someone might.
Its probably postal stationary of some kind, possibly cut from a money order: Higgens & Gage J9, J12 or J15 maybe. Paper on J9 is pinkish and J12 & J15 pinkish to lilac.
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