Printed 'Department of External Affairs Canberra' OFFICIAL ENVELOPE franked with single 1937 4d green (SG 188) tied by A.N.A.R.E. MACQUARIE IS cds dated 7 MAR 1948 with two strikes of two line 'AUSTRALIAN NATIONAL ANTARCTIC RESEARCH EXPEDITION 1947' cachet in black on front. Addressed to SWEDEN.