1859 1p. blue used on folded cover from Buenos Aires to Asuncion carried by steamer on rivers Paraná and Paraguay, tied by "BUENOS AYRES "S"/2/OCT/61" double circle datestamp, fine. (Image)

1863 ca.: Folded cover from Buenos Aires to Corrientes franked by Buenos Aires 1859 1p. blue (even wide margins, fresh and fine) tied by "BUENOS AYRES/1/MAY" double circle d/s and carried by the "Igurey", a Paraguayan vessel, along the Paraná river. (Most covers carried by this vessel bear 1863 datestamps.) (Image)