Thought to show the Aussie RAAF comparison (un issued) bottom cap
And a comparison with OR & Officers colours in my lot
The RAAF stopped issuing the sidecap in the early 1950's and didn't reintroduce it until 1977. As far as I know that style of sidecap was not manufactured after the war.
I still have my Garrison Cap as they are called in the RAAF i have just left and they are still current issue. They are a different design now.