Hi, we know who made them -
Australian Glass Manufacturers Co Ltd was formed in 1915 by the merger of the Melbourne Glass Bottle Works Company and the Waterloo Glass Works Company Limited. Manufacturers of Agee preserving jars ("A.G."). Variously AGEE in similar sizes to American jars, or Agee. The logo is GM fitted in a capital A.
They opened a new glassworks in Penrose, New Zealand, in 1922.
AGM started Crown Crystal Glass in Sydney in 1926, which I see has been posted about here.
Sanitarium Health Food Ltd started earlier, importing bulk Marmite from the UK and repackaging into the distinctive opal glass jars. Sanitarium also opened an N. Z. company.
My interest is in finding more information, related to the different numbers on the bottom, which I would assume relate to the year of manufacture, but perhaps are changes in moulds.
Or even a catalogue....