LOT-O36. A historically important and rare original letter both written and signed byKing August III of Poland. Dated 1740. King Augustus to his son-in-law KingCarlos of the two Sicilies, congratulating him on the birth of his daughter,Princess Maria Isabelle Antoinette of Naples and Sicily. In 1740, King Carloswas Carlos VII of Naples and Carlos V of Sicily. Signed letter, complete withoriginal envelope with royal seal of King Augustus with Polish-Lithuaniansymbols. Folded Letter: ca. 9 x 15 inches. Envelope: ca. 6 x 3 inches. Condition:Very fine, Original. Provenance: private collection.