The Canadian model you're thinking of I believe is 888, it had lime green upper and lower dome with with white base ring.
This isn't a Canadian model but it appears to be fairly uncommon, as most model 858 Constellations were the pumpkin color, followed by poppy red in 1974, which is less common.
There are some of this green model around, but it seems to be less common than the other two colors. It doesn't appear to be in any timelines on the forum, and nobody really seems to know anything about it that I've seen, although it has been discussed a few times.
I would guess that it is from the late 1960s, but I don't know when exactly it fits into the 858 production timeline.
