There are lots of old machines that will zz but most of them will not go on a treadle. Yes that 319 will treadle and zz - you might browse through the vintage photo shop - it's in the sticky and see what people have posted. The older zz machines used disks. I would use almost any older all metal zz sewing machine. Older Elna, Bernina, Pfaff made some nice machines. You do need to beware of the machines with plastic gears. I have a Bernina with plastic gears. Not my thing. I have some awesome older Kenmore machines - if you can find one with double disks - those are pretty darn cool. Some of the Kenmore cabinets had lifts - nice if you want to take a load off your back. I wish you lived close - you could stop in and see a ton of cool old machines.

