From which printing(Ottawa or Montreal) is this?"
There is no guide dots at either the 3 or 9 o'clock positions, just
guidelines.
There has been no reference I could find regarding the guidelines
Perfs
Top and Bottom 11/18.1 x 20 = 12.15
Left and Right 13/21.3 x 20 = 12.21

Horizontal Wove paper

I am thinking Montreal Type D paper, 3rd printing 1888-1889?
According to JOGIL
2 cents (SQ)
11.63 x 11.75, 11.63 x 11.94, 11.63 x 12.00,
11.75 x 12.00,
11.94 x 11.75, 11.94 x 11.94, 11.94 x 12.00, 11.94 x 12.12,
12.00 x 11.75, 12.00 x 11.94, 12.00 x 12.00, 12.00 x 12.12, 12.00 x 12.25,
12.12 x 11.94, 12.12 x 12.12,
12.12 x 12.25Unfortunately this chart doesn't specify which perfs from which of the 5 printing eras.
JOGIL any comments?

Trodent