Nice error note for sure. According to the Charlton Standard Catologue of Canadian Government Paper money 2018 edition your note, if uncirculated, would catalogue at $600 if 75% or upto 90% is offset onto the back. Which it clearly is in that range. However your note is far from uncirculated, in my opinion its a VF grade with a value about 20% of uncirculated price. Hope this helps, Murray