4d Violet, Single Wmk, 1921-22
Printed by TS Harrison in 1921, first issued on 14th February 1921.
Printed by TS Harrison in two printings (March and September 1921) using Electros 1 & 2. Standard texts used to identify these varieties are:
Davidson, AS, & Dix, VW, 1973, Commonwealth of Australia, The George V Fourpence, British Society of Australian Philately
Kellow, J (Ed.), 2014, The Australian Commonwealth Specialists' Catalogue: King George V, Centenary of the King George V Definitives, 1914-2014, Brusden-White