Why are postage stamps issued between 1840 and 1875 often valuable?

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philately Vintage stamp-collecting book.

Postage stamps issued between 1840 and 1875 are highly valued by collectors primarily due to their rarity and historical significance. As these were among the earliest stamps produced following the introduction of the postage stamp in 1840, their limited survival and status as foundational items in the history of philately contribute to their prestige and market worth.1