Australia-1914-20-A KIng George the 5th 5 Penny (brown) With Double Perforation-Illustrated

Shown below is the 5 Pence King George the 5th stamp issued for Australia between 1914 and 1920. The stamp was used for official purposes, official stamps were perforated with an "OS" for official use. The example shown here is a scarcer variety with the double perforation "OS NSW" (official service New South Wales-a state in the Australian Commonwealth)
-See the 1913 "Kangaroo" 3 Pence (olive) this blog. The example below also shows another variety in the perforation size used for official stamps.  The KGV 5 Pence perforations are slightly larger The watermark, the narrow pointed crown over "A", is shown below the stamp face illustration. (called by Australian collectors watermark 2).