The note you have is a Bank of Canada printing error. It is listed in the Charlton Catalogue of Canadian
Government Paper Money, 20th Edition 2008 as E18 - Misplaced Serial Number.
E18-v is described as "Number Inverted on the back" and is valued in the catalogue at $400.
It may realize more or less at public auction based on its condition (grade) and demand for such a note from
collectors of paper money errors.
...Arthur
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Arthur Richards
Contributor, Charlton Catalogue of Canadian Government Paper Money, 19th, 20th, 21st, 22nd and 29th Edition
Pricing Panel Member, Charlton Catalogue of Canadian Government Paper Money, 21st Edition 2009