The Bank Notes (Ireland) Act 1920 came into force on 4 Aug 1920, and removed the obligation of Irish banks to pay their notes on demand at any branch other than the head office. Branch listings ceased to be printed on banknotes as a result of this, with just the head office name on each note.
The Northern Bank and Belfast Banking Company listed Belfast as head office dropping Dublin from their notes, Ulster Bank listed Belfast and Dublin until 1925 when only Belfast was listed thereafter. The other three banks, Bank of Ireland, Provincial Bank of Ireland, and National Bank had only ever listed Dublin as head office.
Banknotes began to be increasingly printed on both sides. Higher denominations of most banks continued to be old style large-sized notes.
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