This is an interesting discussion and I'm glad the subject came up. I have a Sako Lightweight Hunter that I bought somewhere in the early 80's. It was a Stoeger import (per the barrel stamp). I believe that it's an AIII, being a long action 270, and my SN is just over 600,000. I never could figure out when that rifle was made. I trolled the internet and got some info, but nothing that I considered definite. Thanks to ya'll, I'm a bit better informed.
It's a terrific rifle. Wonderful build quality.