Based on the looks of that frame, I'd say you are very close to narrowing it down to it being a 1954-64 frame. 59' model year based on the serial number you found. It could be a CJ-5 or a CJ-6 and you will need to measure for dimensions.
Try using the frame photo below and measure it against the dimensions given below the frame drawing.
![Rectangle Slope Font Parallel Drawing]()
![Font Number Parallel Document Circle]()
Try using the frame photo below and measure it against the dimensions given below the frame drawing.
