The Shackleton Expedition: 1908 (Feb.3) envelope with 'British Antarctic Expedition 1907' printed on the back flap, sent to Christchurch with a 1d King Edward VII Land adhesvive (Sg.A1) tied by the 'Brit. Antarctic Expd' datestamp. This envelope was part of the second experimental mail, the datestamp being used at Cape Royds on M cmurdo Sound and the mail send back on the 'Nimrod', which departed on Feb.22nd for Lyttleton (backstamped 7 Mr)