Great company. Been in a few different locations here in Michigan. Yours was probably made at their old Jackson, Michigan facility. Give them a call. Hopefully you can read the old serial plate. They are pretty good about supporting their older tools.
The Model 40 was an early smaller mill. It is great for doing light work in a home shop use if you have limited space, and can’t fit a full size Index or Bridgeport. This one bridges the gap between the full size machines and the import mill/drills. Not as ridged as a large machine and more prone to chatter, but it is still a HUGE step up from the mill/drills!
Nice find!