I have two sales-spec sheets saved, a 1955 Zenith Model 400 deluxe topload washer/dryer pair and a 1955 Model 200 budget pair. They're in my PotD folder but both files are dated 6/30/2010 so they may be from one of Ultramatic's Vintage Appliance Advertisements threads. I can't share them here in case they are PotDs.
Zenith sourced their automatics from Apex (fiberglass washer tub with water-balance pockets) and this wringer looks Apex-built as well. I wonder if the Zenith name on appliances went away with the end of Apex in '58? Did they build their own refrigerators or source them from Coolerator?
Same auction has a good looking Maytag Freezer (Amana) as well --
Bradross refurbed a Zenith a few years back, a machine displaying many Speed Queen similarities, the tranny in particular, if memory serves. The one featured in this thread actually looks like a Speed Queen cousin.