I'd be really curious to know the bobbin case part number on that machine. While also not common, it's nice to have yet another model to source parts from for a chain stitcher...
That guide is the only way I know of to visually identify one of these particular types of chain stitchers (assuming it is basically the 431G on a diet). The T&S chainers had that guide, but it was removable, and usually in the accessory box, or the heat register on the floor behind the machine or something
I would have thought Stylist, instead of touch and sew, myself, but I mix the two up. I usually like the build quality of the Stylists marginally better than the T&S. The case is weird, it's not sturdy at all. It's let go of my 431G a couple of times. There's no base to it, it just has 2 fingers to hold the machine. I use it only as a dust cover.
I'm not sure the exact time frame when they back tracked. I've had simple stylists, simple T&S and other machines here. A 7174 comes to mind, plus the 514, 457, all of them are incredibly basic compared to the 401 / 500 style machines.