Well I called the used equipment dealer again and he says the tiller is a JD 550 (for $1000), which I understand is only a 50" tiller. He says it might be several years old but the owner bought it new with the tractor and says it might have 200 hours on it. The thing is about 25 miles away across the Dallas metroplex from my office, but I think I'll go look at it.
Alan L., TX
Alan L., TX