This is a commercial folded letter sent from Castelnaudary on July 6, 1791, to Agde in southern France, addressed to Messrs. Bousquet & Cie and signed by Valadre l’aîné. The letter is entirely manuscript, written in flowing brown ink on laid paper with a visible watermark and fragment of a red wax seal. The content pertains to trade, reflecting the economic environment of southern France shortly before the escalation of the French Revolution. Postal routing information is annotated by hand: “reçu le 8, réponse le 24”, confirming the letter’s transit and reply dates. The front bears a neat address and partial straight-line postmark “CASTELNAUDA...”. Items like this are key references for early French postal history, illustrating pre-adhesive communication between merchant houses in Languedoc. An exceptional example of late 18th-century correspondence with intact folds and no missing parts. Estimate "$100 – 140"