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I have a note with the letters H/P in front of the serial number. Can anyone tell me what this signifies? I can't seem to find these letters anywhere.

Your banknote unless graded and in perfect condition is probably worth $1/$2 because many people kept these back in the days and the made many many of them

The HP prefix was used about halfway through the run and had a quantity 10 Million printed.
Charlton Cat. No. BC-45b-i