From the June 2019 Stamp and Coin Expo at Hurstville, Sydney. The very 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. A pane of 6 with booklet with front cover of non-Helecon stamps (bought a few years ago) is on the right.
Only a very limited amount of these stamps were used on cover.