Unfortunately, no. You might be able to use the serial number of the engine as reference.
Like I've mentioned before, knowing the year is really of no use. Everything is done by SN in the tractor world. Year is really irrelevant unless just for bragging rights, or personal knowledge. I would say the PO just didn't know.
I do not know if there was some year cut off for the brakes, but I do know that the parts book shows no serial number break for the brake system. It either has internal or external brakes. I'm going to say that they were just made one way or the other with no regard to when they were produced. May have just been a cost/option thing.
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