Main position dot is centre 1/2 on East or better.
Kershaw's notes
There is a guide dot in the LH oval positioned on the horizontal guide line.
Morel's notes
Position dot touching left oval on guideline centerline and weak vertical frame line, left of "CA" of Canada.
Stamps from printing orders 1 to 5A were perf. 11.75, stamps from printing orders 5B to 7 were perf. 12 x 11.75 and those from printing orders 8 to 12 were perf. 12.