From the 2019 Stamp and Coin Expo. The rare 5d stamp printed with non-Helecon ink (UV checked) from the booklet "EDITION G6". Posted at Launceston, Tasmania on February 10, 1966; only 4 days prior to decimalisation.
Only a very limited amount of these stamps were used on cover.
Rob
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this post "Specialised Collector of Australian Pre-Decimal & Decimal Stamps"