I cannot say much about the paper, except that there are variants with and without silk threads. However, the rectangular postmark says "Fahrpost-Aufgabe", it is probably from Basel, and was used for mail that was handed in for rail or stagecoach transport. See https://www.post-und-geschichte.ch/site/uploads/pdf/artikel_homepage/ch_inland/po_2008_fahrpoststempel.pdf (in German) for details about these postmarks.

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