Trolling eBay tonight we came across a Singer 206k for sale. Interesting looking so we did some quick research and came up mostly empty
Really, though, the likely $300+ price tag will probably keep us away from this machine.
The question, then, is what other 'classic' style zigzag machines - narrow waisted with smooth lines - are out there? We also saw a Necchi that almost-kina-sorta fit the description (the waist was suffering from spread and the lines were a bit abrupt) but the spousal unit wasn't impressed with the looks so I didn't bid on it. I'm sure that some else did a nice looking older zigzag but I'm not finding it.