Thx bvs.

Well the theme of the thread has moved somewhere else. Thoughnteresting I would like to get back to the RAAF observer brevet and my second question:

According to the sources online I believe the more rectangle shapes were the original Australian ones while the other with the shape similar to the RAF ones were replacements made in the UK for the RAAF airmen.
One of the sources is here:

Anyone can please confirm this?