From what I know, Milltronics made multiple models with the Partner 1 designation. Some were knee mills, others were enclosed bed mills with tool changers. We still have a bed mill type Partner 1 that was built in 1995 that we purchased new. It has the worst lubrication of any machine I’ve used in the past 35 years. Stupid grease fittings that you can’t get to without taking the covers off. Other than that it worked flawlessly until a few years ago when it was semiretired for a faster machine. What controller does the one have you’re looking at? That could be a deal killer. Don’t buy it unless it has a Centurion V or newer controller. Cent. V is slow but can be updated. Older models will need to be gutted and replaced for the price of a good newer machine.