There are very few issued £50 notes known from the pre-partition era.
Northern Bank £20, £50, and £100 notes from the 1914-1918 era which were overprinted for use in Northern Ireland post 6 May 1929 are well-known, and most varieties are readily available.
Nothern Bank Fifty Pounds 1914 with 1929 overprint.
Fifty pounds was a huge sum of money in the era of the old banknotes and it is unlikely that any issued, non-cancelled notes would have been retained except by accident. However, examples of early £50 notes are available to collectors in the form of cancelled or specimen notes.
Here is an example of a Provincial Bank, Limerick Branch, specimen note from the 1830’s with portrait of William IV.
Attachments
Provincial Bank 50 Pounds Specimen ca.1830-1837 Limerick.jpg (169.7 KiB) Viewed 294 times
Here is an interesting example of a £50 Belfast Banking Company proof note showing on the front the design used for the Original Issue (1827-1850) and on the reverse Belfast Banking Company Limited implying a date post 1883. PMI proposes that these mismatched proofs may have been prepared in 1922 from original plates for archival purposes.
An Original Issue £50 uniface proof note is also known from the 1827-1850 era but no examples of issued notes from the original Issue are known to have survived.
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Belfast Banking Company 50 Pounds Proof ca. 1922.jpg (153.22 KiB) Viewed 185 times
Belfast Banking Company 50 Pounds Proof ca.1922 Reverse.jpg (112.96 KiB) Viewed 185 times