Australia Antarctic Territory #L19-L22 1971-1972 Antarctic Treaty and Cook Issues, Fine NH and VFNH Set, Plus Additional Paper Varieties
Fine NH and VFNH sets of the 1971 Antarctic Treaty issue and the 1972 Cook issue, with the 1971 Antarctic Treaty issue being printed on 3 different levels of fluorescent paper - a difference not listed in any catalogue I am aware of.
The comparison picture shows the differences in the paper fluorescence, as viewed from the back.
Scott lists the basic stamps at $17.75 for VFNH. The stamps here grade between 70 and 80.