Just dropped by to bump this thread, to mention that my 2270 has a gold lacquered 'engraved' faceplate, but my S/N is 22316, and that is way past 5000. Though I've read elsewhere it may be Canadian model. I got it off ebay 10-12 years ago.
And IIRC, the seller was in either, Detroit or Cleveland, so it being Canadian wouldn't be too outlandish a possibility.
Though the geography isn't all that conclusive, really, as I'm in NJ, and I've picked up a few pieces of Canadian gear here, locally, as well.