Thanks for the suggestions. There are lots of singer 66's in my Craigslist. One is asking 150 and is treadle (with her cabinet) and looks to be in good order. A few more "antique singers" with no knowledge of what model but look to be 66's as well? Some are motorized some not. I really need time to sit down and read.
Which machines also do multiple stitches? Or rather ZZ and others? I believe it was here someone posted a video of a lovely green machine that had been converted to treadle and it was doing lovely stitches.