Probably about 1980 - I'd guess either CDN or J spec - both were fairly similar and there are comments that the final batch due to go to CDN that year was pulled, tweaked, and sent to J instead. The bigger sidelights and wing reflectors were shared, and I think after CDN got strange mid-70s high-level bumpers they may have reverted to more normal ones at the end. Is it RHD or LHD?? (although I'm not sure if J Minis were always RHD, such as that final re-assigned CDN batch which in a small book photo looks LHD).