The M22 that I had in my deuce had a provision for a TCS plug in. I'll have to look again, but I don't remember seeing it on this one. I agree those numbers I gave really don't appear to be a sequential vin number, but it's the only other stamping in the main case.
A friend of mine is wanting to sell it, but he wanted to be able to tell a prospective buyer what it came out of. I'm not sure were going to find out.