Hello Ratdog

This is an early Victa Imperial.

A History Record is available here: -
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/72511/victa-imperial-c1966-1978.html

Note the early handles, clutch and front height adjuster.
The engine is not original. It would have looked like this: -

[Linked Image]

Hope this helps
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Jack