About two months ago, I was given an old Bush Hog brand rotary cutter. The cutter is in pretty rough shape but I think it can be salvaged. The deck is rusty with some holes ( one pretty large one) and a few breaks, but the gear box is very smooth. When I first got it, I thought it was an older model 305 but after finding the I.D. plate on it, I found out it was a model 600. Can anyone give me any info on this model such as the years it was made, is it a light duty or medium duty, or any info at all. Cant seem to find hardly anything on the internet about this model.