A	Australia Post
C	Collector (on AP cover)
G	PMG Generic/Shield
Z	PMG Generic/Hermes
S	Special Issue
T	Challis
E	Excelsior (Baglin)
U	Guthrie
H	Haslems Cover Service
J	John Gower (pre-WCS)
M	Mappin and Curran
L	Miller Bros (Orlo-Smith)
Y	S Mitchell
P	Parade, ACCA (McCallum)
Q	Queensland Stamp Mart (?)
R	Royal
B	Southern Cross Printers (Bodin)
W	Wesley (WCS)
I	Wide World
X	Pharmaceutical
O	Other non-AP