Hi Nixnax,
Welcome to the SCF.
Instead of just giving you the information, I thought you might like to check out this website...
http://www.postbeeld.com/en/fsc/home/Select the country as "Australia", then select the year.
You are able to select a range of years so type in 1953 to 1966.
QEII started her reign in 1953 and decimal currency started in 1966, so stamps with QEII on them must be between these years.
The first stamp you listed is the Queen's Mother (I think), so this will be earlier, around 1942. Happy hunting.
Steve


