These are great machines, but beware that quite a few have been abused. I have looked at more than my fair share, and have personally owned a 2H, and now own a 2K. I rejected quite a few machines before getting the one I have now, which is a gem.
NMTB 50 tooling is cheap, and available everywhere. Overarms, vertical attachment heads and their drive gears, etc....are not. Be sure of what you are getting, and what you expect from the machine. Even a worn machine is capable of doing good work, even if it won't make parts for a NASA spaceship anymore.
Not being able to test feeds and speeds can run you into a situation where you've got a pile of spare parts on your hands instead of a functioning mill.
Personally, none of these older mills are worth more than scrap if you can't verify that they run well, and that speeds, feeds, rapids, etc.... all work. They are a major PITA to work on when something is broken, and never cheap to repair. I have a friend who's been inside the knee of his 2H to make repairs, and it was no fun at all, and he's tenacious.
I paid $1000 for my 2K, in great shape saved for a broken handle (which I have fixed). It came with 7 arbors, a 500 lb. box of cutters of various sizes, and I was able to run it before buying it to verify that all the speeds, feeds, and the rapids worked for the front and side controls.