Main position dot is slightly South centre and is full. (This is a position difficult to determine.)
Kershaw's notes
The short transfer is weak and isolated in the TR corner of the spandrel. The LH oval guide dot is slightly offset below the horizontal guide line
Morel's notes
Left oval dot at 3 o'clock, faint vertical transfer at upper right.There is also a small mark in the white part of the large Oval, just below the C 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.