Next time I am in Western MASS I need to try to stop by to see the old factory - remnants are still there from what I read. I was next to Athol couple of weeks ago, but did not have time...
Leaving aside that Athol is in Worcester county, which is not Western Mass. I sorta collect tools from that part of the world, and keep an eye out for cheap Goodell Pratt, Union, Millers Falls, Starrett, etc tools at the fleas.
I used to have to go to Athol regularly when I lived in Franklin county. The big old redbrick factory is still there and operating. It's just outside of the downtown and easy to find. My understanding (probably 20 years old now) is that there are no tours as such, but if you reach out to them in advance nicely, their PR guys will sometimes show you around.
Starrett has been basically keeping Athol alive for a generation now. It is an old mill town with just one mill left. Unless it has changed, the downtown store fronts are basically a collection of social service agencies. There were rumors a while ago of a move to the Carolinas, which would have just cratered the place.
You can guess what the rest of the inhabitants of the Commonweath jokingly call the residents of Athol.