I Am trying to track down a proper year of manufacture plate but here in Ontario they stoped issuing plates every year after 1972. In 1973 they issued you a plate with a corner for a renewal sticker, it was the last year of plates to have an actual date on them. Exception still being farm plates, diplomatic plates, truck plates, bus plates etc...
Techincally my 74 should have a 1973 plate with a sticker or a plate with no year on it at all and a sticker.
Right now I have a plate with BJND.