This is a bit of a tricky one, the serial puts it at 1970 from my understanding, now the designated run of the Model 568 or V68, was 68-69, and the next listed self propelled is the V98, running from 71-72.
Now it could be a mater of serial code change over, at this point there was still some slight, uncommon variance in serial layout, so it is possible the date is derived from the 9, however I hedge towards the 70 marking.
The other consideration is the fact that the V68 likely continued its production past its designated model run, which was common enough, in fact it likely ran till the 1971 release of the V98.
Further, the G3 was not really seen all that often till early 1970, there was some limited test releases of it in 69, but to my knowledge, these were limited mostly to the corvette, the 69 V68 would more likely be seen with a G2 or in some cases, a 3Q.
So based on these factors, I feel this machine most likely a 1970 V68 Victa Self Propelled, with an early G3 carburettor, and the basis of the Series 70 MKI engine (Impulse starter, G3 Carby, point Ign, no decompression) normally the S70 was coupled with the box type, under deck exhaust, but in its pre release, and side release variations, it was not always so.
