It should be easy enough to compare the serial number and compare it to Oct, Nov, Dec 41 known serials, and Feb/Mar 42 serial numbers to see if this serial falls in between those. A list like Peter Ford's infoex would have solved this quickly.
I also think on the first Monday of the year, the guy making the plates buggered it. After all, he had been changing the day on the embosser daily, the month monthly, and never had to really think about the year.
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