Hello Sean and Pope

This was Victa's approach to making a utility mower safe for the 1970s.
And a damn good mower it was too. It's a Victa Special.

The orange colour and snap-lock handle lead me to believe it was first
introduced for the 1973 Range:

https://www.outdoorking-forum.com.au/forum/ubbthreads.php?ubb=showflat&Number=62024

I have no idea how long they stayed in production.
Perhaps a photo of the series 70 decal will confirm what I think.

Hope this helps.
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Jack