1856 (July). Cover from Santiago to Voghera, Sardinia, bearing 1855 Second London Printing 5c brown-red on blue paper, marginal example from the right of the sheet with good to huge margins, tied by concentric circle obliterator with despatch cds adjacent, carried to Valparaiso and placed onboard a PSNC packet to Panama, with red and black Panama transit hs, then from Colon onboard RMSPC SS "Dee" to St. Thomas and RMSP SS "ParanĂ " to Southampton, then via London, Calais Turin, Alessandria and arriving in Voghera, "29" decimes charge hs, missing side flaps; as far as we can say, the only cover addressed to Sardinia until the Second London Printing issue, and regardless of the destination, mail sent abroad with this stamp is very rare.
Note: The Hackmey collection did not include a cover with this stamp to a foreign destination, nor did the Blank, Quast or Hubbard collections. (Image)