G'day Patrick,
I'd say that the chassis is a 1967-68 Corvette 2, Model 543 if it was a 160cc or 545 if it was a 125cc originally.

The download linked at the top of THIS page is very useful for working these older Victa and Pace models out.

The engine number is from 1967, so it could be the original, just with a Pace front cowl. Or a complete swap from a 1967-68 Pace Premier...
The carby is a 3S, which is correct for the Corvette 2 160cc [but not the Pace Premier], according to the Green Book. Yep, it's missing the tickler. Carby info download is HERE

That fuel cap is missing bits - looks like it was originally a mechanical fuel gauge type, which Victa used for a few years on their top of the line models. Working [or even complete] ones are very rare now. They never did work very well, and were superseded by the optical gauge of the VC series.

Yours looks like it has had some sort of bottle cap shoved into the gauge recess, as a plug.


Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."