My grandpa showed me his Mark III red dot sight he bought new many moons ago. He still has the original paperwork (of course, he has ALL the paperwork for everything he's ever purchased). It is still listed on AimPoint's website, and lists manufacture between '83 and '86. I thought it was cool, so I thought I'd share.
https://www.aimpoint.com/product/aimpointr-mark-iii/
https://www.aimpoint.com/product/aimpointr-mark-iii/