I have done some investigating of the "asterisk on the back" error. A top Bank of Canada error collector tells me he doesn't have one, and has never seen one. So I started to work on when and how this error got listed in the catalogue. I learned that only one note of this sort was ever reported, believed to be a 1954 $1. It was stolen in a robbery of the owner's home, many years ago, and has never resurfaced. I interviewed the owner, who believes it was simply spent, in which case there is a good chance it was eventually withdrawn and destroyed. Unfortunately that means that we may never have a chance to assess the note to see if the error was real or manufactured with somebody's typewriter. Any mechanism that I can devise for the legitimate production of such an error defies belief, such as the sheet being turned over, then a stray piece of junk intercepting all of the serial numbers except the asterisks, or some kind of crazy wrong-side set up sheet when the assembly of the numbering machines had only begun. I think that unless such a note materializes and is confirmed to be real, this type of error might as well be dropped from the 22nd edition.