50 Pounds Northern Bank

Northern Bank Limited was a privately chartered commercial bank operating in Northern Ireland — not a central bank — yet it held note-issuing rights under the Currency Act (Northern Ireland) 1927, a retained privilege that persisted through multiple ownership changes. By 1990 the bank was owned by the Midland Bank Group, making this note unusual: a high-denomination sterling issue backed ultimately by an English clearing bank rather than any public monetary authority.

Thomas De La Rue's production at this value tier typically included intaglio printing for the main face elements, though the security specification here lists only watermark and thread — modest by the standards of what De La Rue was capable of by 1990.