Any idea on the age of this saw and how you’d be able to tell.

[Stere]

Yeah  it  also has  wood boss  so  the middle model i think.

[pleasant]

Has to be pre 1989 due to the early metal riveted nameplates instead of the later grey plastic ones, and most tellingly the stihl metal badge on the recoil cover has made in west germany on it. West germany ceased to exist when the wall came down in 1989