Hello Dopo
A warm welcome to ODK from me.

This is a very early 1970s Imperial.
Note that it has the single point height adjuster and
new style centrifugal clutch, but before the 2-stroke Imperials.

I guess a lot will go to personal attachment to this mower.
They were certainly well-built with a long heritage.

Many wearing parts will still be available.
I think it goes to tenacity and research.

I guess you have read the History Record: -
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/72511/victa-imperial-c1966-1978.html

Please keep us informed.

Cheers
Jack