This brick, with the word “FOSTER” stamped into it, I came across in the long grass next to the old gasworks site. The gasworks is interesting for its demolished and derelict buildings and there are lots of older-style bricks that’ve been re-used as pavers or ballast.
I’m not sure if it’s the same mob, but the History page of the Wallbank Australia website has this to say:
“A further development [in the history of Wallbank Australia] was the acquisition of the plant and equipment used by G. Foster & Sons in the manufacture of brick making equipment in 1978. This followed the cessation of business by that company which had previously competed in the manufacture of brick making equipment.”