1859 Transatlantic mail. Very fine envelope sent from London to Peterboro, Canada. Prepaid at the single 6d per ½oz Canadian packet rate by a 6d Lilac (SG 68) tied by a London City "12" numeral with a red, crossed circle inspectors mark alongside and a Liverpool transit datestamp for FE.19.1859 at lower left. Letters not directed to a particular line could be sent to the first packet to sail, even when paid the correct postage for another line. Although this cover was prepaid at the Canadian Packet rate it was sent from Liverpool per Cunard steamer "Europa" to New York as this was a more expensive packet rate the cover shows a "1" accountancy handstamps for deficit due for onward delivery through the United States and a "2½cy" Canadian currency equivalent.