You collectors know more about this than I do. My father saved this $1 Canadian note dated 1973 around 1975 when he was working in Amherstburg. He put it aside after cashing a cheque at the bank so it has not been handled much. However, I took photos to show on the edges that there is virtually no deviation from flat at the bottom center and only the slightest at the top, but the tiny irregularity can be felt at the top. The rest of the note is perfectly flat. In any event, it is perfectly clean as it came from the bank. High bidder pays $1.50 shipping in the US; $2 to Canada and worldwide. (We combine shipping so buy other of our items.)