By the late 1800s banknote designs had settled down to a uniform format with branches listed either in the centre or on both sides of each note. The number of branches listed on notes steadily increased as the banks expanded their networks.
The Northern Bank listed its branches around the four edges of its notes until 1918, when it began to switch to listing the branches in the centre of its notes.
Colour underprints had already been a feature of the banknotes of Bank of Ireland, Ulster Bank, Northern Bank and Belfast Banking Company since the 1860s or earlier. Both the National Bank and the Provincial Bank of Ireland introduced colour to their notes in 1900.
In 1918 the banks began to reduce the size of some of their notes, following the lead of the Bank of Ireland when it reduced its One Pound notes in size. This may reflect inflation producing an increased need for low denomination notes in circulation.
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