Hello gnomester
This presents as a Utility base.

By the late 1970s - early 1980s - it appears that Victa abandoned its red colour, a symbol
of their 'Professional Range' in favour of green. Also, The full crank Victas sold alongside
half-crank Power Torques for a period (depending on the model).

Also at this time. the old red utility base was replace with a small safety skirt (like yours).

Best guess, this is a late 1970s base, but prior to 1983.
But I am not an expert here.

https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/70751/brochure-victa-1983-84-range.html


Hope this helps
----------------------------
Jack