The National Bank was unusual among the issuing banks in Northern Ireland in that it changed the designs of its Northern Ireland issue to a completely new design relatively early when it replaced its Series E First Northern Ireland Issue with a new Series F in 1937. This was to be the National Bank's final note issue as the bank was taken over by the Bank of Ireland in 1966.
There are two design varieties and four signature variations for Series F banknotes, giving four basic Types.
Dimensions
All denominations are the same at 152 x 85 mm approx.
All the dates have been recorded for Series E: £1 Notes, 5 dates; £5 Notes, 3 dates; £10 Notes, 2 dates; £20 Notes, 1 date. Examples of all the recorded dates can be viewed in the National Bank date listing 1937-1964.