New Finds
Possible Herrman Co buttons: 1922-1933
There are two clues as to the maker of these buttons. the first is the Letter ‘H’ at the top (see http://www.austbuttonhistory.com/25th-july-2020/ for a more complete card). The second is that this design was used by the firms that grew from Herrman Co., O. C. Rheubens and then General Plastics.

A 1940s and a 1950s example.
Maxart and Woolworths

A faux-uniform fashion button, 1980s Maxart

Metalised plastic. Early 1970s Woolworths.