1950 (Feb) cover to London with cachet Type IX (boxed 'TRISTAN DA CUNHA/SETTLEMENT OF/EDINBURGH/SOUTH ATLANTIC', carried on RMS 'Caronia', bearing South Africa 1949 Voortrekker 1½d tied by 'CAPE TOWN/KAPSTAD/PAQUEBOT' cds, very fine and with accompanying 'Caronia' picture postcard