This is one of those "right time at the right place" stories with a little "they don't make 'em like they used to" throwed in.
25 or 30 years ago a decades old repair shop went out of business and had an auction. When they got to this grinder, the auctioneer started at $200, worked his way down to $25, and still nobody bid on it. I said $5 and got it.
It weighs almost 300 lbs and came with 2 extra wheels. Replacement wheels cost over $100 now. It is flat belt driven with a 1 1/2" shaft.
Most bench grinders can be completely stopped with just moderate pressure on the wheel. I have really put my weight into this one and it doesn't even phase it.