Great Britain and British Commonwealth BRITISH COMMONWEALTH AUSTRALIA Air Post Officials
Sale No: 0919
Lot No:587
Symbol:**b
Cat No:CO1,O1-2
1931 overprinted "O S" 6p olive brown upper left sheet corner margin block of six, also overprinted on regular issues 2p dull red and 3p blue, blocks of four, n.h., fresh and fine-v.f., cat. $1485 (Cat No. CO1,O1-2) (Image)