I had a JD1600 chisel like you have picture only without the walking axles it was a good match with my 4640. The differences between a 1600 and a 1610 are a 1in, thick shank and  a brass bushing walking axle pivot versus  roller bearings. It was a good plow never had a any frame issuses and if you broke a shank you replace them with the thicker ones. I  have 610 folding  chisel now and like it behind my 8650. I have pulled out some huge rocks and even a old buried hot water heater and never broke or bent one of the 1.25 shanks. That  looks like a good plow and I liked the the long tongue . I have a operstor manuel for a 1600, they use that mainframe and added wings to make up to 24ft wide  machine.