1930 Charles Sturt Centenary 1½d Carmine-red with Lord Howe Island manuscript overprint '2d/paid/PM/LHI', large part OG and with small authenticating handstamp 'A.R.' (Alec Rosenblum) on reverse, very fine. BW 139c, cat AU$850, SG cat £700
1931 2d and 3d Kingsford Smith overprinted 'OS' used with 3d Green Airmail pair, 3d Sturt (2) and 6d Kingsford Smith pair on airmail cover, tied by 'PARLIAMENT HOUSE CANBERRA/F.C.T.' cds, 12 MY 31, and addressed to Stanley Gibbons in London. A rare contemporary, albeit philatelic, usage (the earliest possible use of the OS opts was on 4 May 1931). Cover with peripheral wear and ink stain at left edge, and with 2003 Ceremuga Certificate
1931 Kingsford Smith 2d overprinted 'OS' used with 3d Victorian Centenary on 1934 (23 July) Brisbane - Cairns cover, intermediate leg of Ulm Australia - New Guinea flight (AAMC 3955a), minor staining. An unusual and very scarce use of this Stamp