rkadeYT

rkadeYT OP t1_ir8oag1 wrote

It sounds like they had some warning of the plan from gathered intelligence:

>The Bank of England first learned of a plot from a spy as early as 1939. It first detected the existence of the notes in 1943, and declared them “the most dangerous ever seen.” (source)

There are also very subtle differences, a couple of which are described here.

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