Pretty Neat =) Nice find. Welcome to the forums.
If you are interested in collecting Canadian Paper money I suggest you head over to your local book store (chapters, indigo etc) and pickup the most recent copy of the Charlton Standard Catalogue for Canadian Government Paper Money 23rd 2011 Edition.
That being said your note would be considered an Offset/Wet Ink Transfer error (E3 in the Catalogue) in Uncirculated condition you are looking at around $100. Your note, would be less because it was circulated and quite a few security planchets on the top left face of the note have been removed. It would really be hard to grade your note based on the photos provided.
Maybe another member can lend their grading expertise to this topic.
Cheers.