212-65 year?

Thanks to all your collective info - I can confirm that this amp I bought used years ago with no badges is indeed a 212-65.

Can anyone tell me the year? Based on what I have seen on this forum, I am guessing 1979 but would love an expert opinion.

Serial number is CN01852

I have reached out to the guy on another thread who is fabbing the badges (genius idea by the way) in an effort to sell this beast.

Any info appreciated - nice to know this forum exists.