that is a model BE plow. They came in 3 and 4 bottom versions for the 3 and 400RN tractors. I have hours of seat time on a 300RN pulling a plow just like that one. The model MT would be more vintage correct for your 530 tractor. I have had a lot of seat time on a 541C with an MTA34 plow also.
Sorry the scan of the lit got a bit cropped off.