G'day shacl
Yep, a series 80 Tilt-a-Cut.
I would like to say something about the other edger....
It now appears that small engineering firms across Australia engaged
in lawn edger making. Lawn mowers had become too sophisticated by the 1960s.
But edgers were so doable!
Yours has a Victa Industrial Engine and it would date from the 1970s - best guess.
It is certainly a professional job - with the blade casting and all.
In many cases identification will remain problematic without other clues.
Cheers
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Jack