Catalog
50 Pounds - Charles III Alan Turing, polymer
| Issuer | Bank of England |
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| Year | 2023 |
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| Composition | Log in to see details |
| Size | 146 × 77 mm |
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| Obverse description | Intaglio portrait of HM King Charles III at right beneath the royal cypher 'CR'; at centre, a vignette of the Bank of England's Threadneedle Street façade is set against intricate guilloche underprint incorporating the Bank's coat of arms. A multi-element security window stripe at left integrates a holographic crown motif, with the Chief Cashier's facsimile signature at lower left and the denomination '£50' in large numerals at upper left in red. |
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| Reverse description | The reverse pays tribute to mathematician and computing pioneer Alan Turing, with a table of numbers drawn from his seminal 1936 paper on computable numbers at centre, surrounded by technical imagery evoking early electronic computation, including a representation of the Pilot ACE computer. A portrait of Turing and a ticker-tape sequence encoding his birth date are incorporated into the design, executed throughout in deep red-brown tones over fine-line guilloche patterning. |
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| Protection description | Large security window strip with holographic crown and colour-shifting '50' numeral integrated into the polymer substrate; portrait watermark of HM King Charles III visible within the clear window area; optically variable denomination numeral. |
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