1848 entire letter posted at the British Post Office at Rio de Janeiro addressed to Syra. Endorsed per "Firebrand" (a Royal Navy frigate) to Falmouth. From there via Marseilles to Syra by French packet. Various postal markings and rates, including COLONIES / & c.ART.13, exchange instructional marking applied in London. See detailed article in Philotelia issue 699 (2016), and also page 373 of vol.I of J.Daes book "The Hellenic Postal Rates 1828 - 1875".
Extremely rare, certainly the earliest recorded letter between Greece and South America, a key item in Greek preadhesive postal history.
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