From their web site, it appears to be a model B-4. It is currently available in either single or 3 phase variations. No way to tell from the picture what power the one your looking at needs. Worst case, you would need to buy a small converter (the tool is 1/2 hp) to use it. Their web site lists current spindle sizes which are all quite common. Sleeves are available in various grits from numerous vendors on the net. It looks like a serious production machine that will work great for a long time.
I have a mind like a steel trap....
....rusty and illegal in 29 states.