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What is stamp ephemera, please?
Briefly stated (excerpted from Wiki):
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Ephemera are transitory written and printed matter not intended to be retained or preserved. The word derives from the Greek, meaning things lasting no more than a day. Some collectible ephemera are advertising trade cards, airsickness bags, bookmarks, catalogues, greeting cards, letters, pamphlets, postcards, posters, prospectuses, stock certificates, tickets and zines.
In other words, based on my previous reference, it is stamp-related and post office-related papers, documents, cards, receipts, labels, advertising, etc., that are not stamps themselves, but directly or indirectly relates to that collecting discipline.