I have heard about them. They never turn up here either, and unless you can find a 301 made for Canadian Voltage, I think they all are 110V. They are nice, owners brag something awful about them; a slant shank portable like the 401Gs and 431s, but weight a bit less and has a handle on top. It's a straight stitcher only with a built in gear driven motor.
It's a full size machine, and the closest we come to it here (most Singers sold here were made at the Kilbowie factory too) is the later beige 201K23. It has the lighter aluminium body like the 301 and are one of the best straight stitchers around. For a while I thought the 301 was slightly smaller, but it's a full size machine.