Unfortunately, plate numbers won't help much... In my own unrelated observations, plate numbers to not have a significant enough variation to be remotely reliable in determining whether a 1000000 (one million) note has been "raised" to a 10000000 (ten million) note.
You can rely on the fact that 10,000,000 notes were only used up to a certain point, and this information is available in the technical data section of the Charlton guide, specifically p262 (and others). For example, the last CBN $1 10,000,000 note had the prefix T/O, and the last BABN note was N/P 10000000. All 1967 prefixes featured 10,000,000 notes. So, if you see a Bouey/Rasminsky 10,000,000 note, you should view it with complete skepticism. A Beattie/Coyne 10,000,000 is far more likely to be legitimate.
Further, the CPMS has a registry of known surviving 1954 10,000,000 notes. I don't recall when it was last published, but I know it exists.
Logged
BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.
