The FPN on most notes in the early M series are very difficult to read. They are VERY finely engraved and nearly impossible to see without strong magnification.
I've looked at a very substantial number of $1 notes and I assure you that there is a FPN present, but it is impossible to see at that resolution.
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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.