Torrot do not surface very often, especially in Canada! The bicycle may actually be from the late 1970s. I have seen another like this and, IIRC, it had mid-range, Simplex from the late 1970s. Also, some 1973 literature that I have states that there were only two Torrot models imported that year and this matches neither.
Normally, I would expect a bicycle of this apparent era that was equipped with brake clips and forged dropouts to be constructed of a higher grade tubeset. However, I do not recall seeing any tubing decals on the other, similar Torrot. Regardless, as previously suggested, the seat post diameter should give us a good indication of the tubing grade.