Eric, check out the GE PortaPotty page:
http://www.rwhirled.com/portacolor/

A little more than half way down there's mention of a Canadian version.
"This photo of an early Canadian model PortaColor (1120VWD) was sent in by Chris F.. Notice that this TV only has one tuning knob. That's right-- it can only tune VHF stations. While all USA-model PortaColor sets are "all channel", Canada didn't require UHF reception to be avalaible on all TV sets until around 1970. Therefore, I'd assume UHF tuners would have been optional -- at additional cost -- on PortaColor sets in Canada the first few years those sets were offered there."

You'll find pix of 2 sets owned by Chris F ( zappyman@ hotmail.com ) Remove the spaces as needed

Anthony