Home / Stamps / Australia & Territories / George V / Kingsford Smith – Airmail OS Kingsford Smith – Airmail OSPrice: $45.00 1931 Kingsford Smith’s Flights Air Mail overprinted OS. SG 139a Fine Used Out of stock SKU: 100045 Categories: George V, Stamps Specifications Value Appraisal Product Features Additional Products Opening of Parliament House $0.50 BUY NOW Sturt Centenary $15.00 BUY NOW Centenary of Western Australia $1.50 BUY NOW Centenary of Western Australia $1.00 BUY NOW