irishpapermoney.com

I came across a Ploughman note with an interesting bank stamp on its reverse recently.

A Provincial Bank of Ireland One Pound note stamped 'Bank of England Birmingham' on the reverse.
Presumably it was paid into the bank's Birmingham branch.
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An interesting stamp on the back.
Some bank stamps can give useful intel on a bill's circulation.

Yes, it shows that the Bank of England was active in redeeming Irish banknotes on behalf of the Currency Commission and Central Bank of Ireland.