B of E 10 Shilling Note 1967 optical illusion

This one is driving me nuts, it looks like a printing error but then it looks like the paper was cut wrong, it is exactly the same measurements top and bottom right to left.

 

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Try measuring both diagonals (forming an X). If they are different lengths then the paper is not "square" (which may mean it wasn't cut correctly). If they are same length then I dunno.

 

Thank you, yes you are correct just a tad over 1mm difference.