Some Canadian 10-dollar notes printed in 2007 with the Jenkins-Dodge signature combination were printed on paper intended for 20-dollar notes. They therefore have Queen Elizabeth’s portrait and the number 20 as the watermark, a security thread with demetalized “Canada 20”, and the holographic stripe with the number 20. There are at least three ranges of the error notes with prefixes BTT and BTU. Six notes have been confirmed so far, though there could be many more notes in circulation.
For more information, please visit Canadian Paper Money.