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| 表面の説明 | Intaglio portrait of Sir Samuel Davidson (1846–1921) at right, rendered in fine engraved detail against a guilloche underprint in teal and green; a vignette of a tea dryer and centrifuge machinery occupies the centre-left, with floral decorative elements and the denomination 'Fifty Pounds Sterling' in bold letterpress. The date '1 November 1990' and the Chief Executive's signature appear at the lower centre, with serial numbers in dark ink at left and lower right. |
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| 表面の銘文 | ログイン して詳細を見る |
| 裏面の説明 | ログイン して詳細を見る |
| 裏面の銘文 | ログイン して詳細を見る |
| 署名 | ログイン して詳細を見る |
| 偽造防止技術 | Watermark, Security thread |
| 偽造防止の説明 | ログイン して詳細を見る |
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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.