The stamp on the
LEFT looks printed by
typographed....The stamp on the
RIGHT looks as though it was an
engraved printing....Engraving usually has sharper stamp detail than typographed stamps...As you can see by the close up below.

The 3 stamps below, the 2 on the left are mine and the far right one is borrowed from Archives Canada. Notice the spacing on these stamps on the "P".... Big difference..Though at first there may have been TWO separate printings of this Scott 11...Typo and engraving...Interesting theory.

Here is a closeup of the TWO stamps...

CONCLUSION
These 2 stamps leave a lot to think about.