Just further to John's comments - I think it's later than 1970 for bikes (dunno about cars).
My Waterbottle is a '74 model, original Australian delivery and it has no compliance plate.
My Kats have them and I don't own anything in between, so some time after '74 is closer to the mark I reckon.
Just as an aside, it's not difficult at all to register a bike without a compliance plate as long as it never had one fitted for that year in Australia.
I just got a safety cert for the Waterbottle and took it to TMR and it was all good.
Same, same with my T20 ('66 model).
If you import a bike that's pre-'89, and it would have had a compliance plate fitted otherwise, you can get it registered in QLD via the LO1 'plate' process.