I've had this old looking Aussie plug for a long time, I've no idea what it came off.
But here's an odd thing, in the middle photo, looking at the back of the plug with the earth pin at the bottom (which is the mounting convention) there is a "~" symbol embossed by the right terminal, and a "0" on the left, but according to:
https://en.wikipedia.org/wiki/AS/NZS_3112
the left terminal of the socket outlet plate is live/line/phase/active, and the right side is neutral.