"Sirius" Final Return Voyage, New York Jul. 1st - Plymouth Jul. 16th, 1838, folded Jun. 30 cover from New York, N.Y. to London, England, endorsed "pr. Sirius", flap with red "Ship-Letter/Plymouth" framed handstamp and red London (7.18.1838) arrival cds, manuscript due rating, Very Fine and choice, ex-Boettger. Estimate  $750 - 1,000. Sirius made only two roundtrip transatlantic sailings for the British and American Steam Navigation Company. The company chartered the Irish Sea steamer from the St. George Steam Packet Company in order to beat the "Great Western" for the first transatlantic steamship voyage. $0 (Image)