SteveSr
Addicted to ArboristSite
The A/F cover is wrong. The correct one should have a round knob not the rectangular one. The "Pro" cover likely came off an 036 Pro model which I believe was introduced about 1996 or so.Here's some pics. We'll see if they upload since the smallest setting on the phone is still huge
It also looks to have the Tillotson carburetor on it which puts the age of the saw in the 80s to possibly early 90s. The interesting thing is that it has the low profile tank vent on the tank which I thought was implemented later along with the compensating carb and wider air filter. The tank may have also been replaced at some point or you have a "Frankensaw" assembled from parts of various vintages.