Australia 1966-73 deep blue error, SG386cb Space & Aviation Odd trivial gum bends mentioned

Odd trivial gum bends mentioned for accuracy

each denominated "20c"

and is headed "Confidential and personal"

The letter is addressed to Lt

dated '16 X 44'

Australia 1966-73 deep blue error, SG386cb Space & Aviation Odd trivial gum bends mentionedAustralia 1966 73 5c deep blue error, SG386cb. Upper left corner block of 6 (3x2), comprising two horizontal strips of three, each with the left pair ERROR IMPERFORATE. Exceptional quality, unmounted mint with full original gum. A spectacular modern rarity, especially desirable and important in this attractive positional form. Only 20 strips existed, from two sheets discovered. These were the first stamps issued following the decimalisation of