Well, I can't believe my luck. I found a Brother Opus 821A (made in Japan) yesterday in a cabinet that has never been used. It has a factory sticker on the slideplate and on the stop motion knob. These would have certainly been rubbed off if it was used. I took off the footplate and there was not even a hair from a dustbunny under it. No lint or fluff anywhere!!!
But because it was never used, it was never maintained. The needlebar was locked up solid and I had to remove the needlebar assembly to be able to use a hammer to tap it back and forth to free it up. Not even TriFlow was working.