10 Pounds Bank of Ireland

Bank of Ireland's Belfast office issued notes separately from the Dublin head office during this period, a distinction that mattered legally under the Currency Act (Northern Ireland) 1927, which kept Northern Irish commercial bank issuance alive long after Free State banks lost their independent note-issuing rights in the south. The Chestnutt/O'Neill signature combination places this within a narrow window of the series — H. H. M. Chestnutt served as accountant, O'Neill as governor, and their paired tenure helps date individual notes more precisely than the broad 1971–1978 span suggests.

Paper quality on this type is worth attention: Belfast-issued Bank of Ireland notes from this decade are known to show foxing along the fold lines, particularly on higher denominations that circulated less and were more often stored flat in damp conditions.