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50 Pence - Elizabeth II Tommy Flowers
| Issuer | Tristan da Cunha |
|---|---|
| Year | 2021 |
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| Composition | Log in to see details |
| Weight | 14 g |
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|---|---|
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| Obverse lettering | ELIZABETH II · FIFTY PENCE · TRISTAN DA CUNHA 2021 |
| Reverse description | A stylised typographic portrait of Tommy Flowers, the British engineer credited with designing the Colossus computer, composed of alphanumeric characters and encrypted text arranged to form his likeness. Concealed within the design is a coded message intended to be decrypted by the viewer. The subject's name TOMMY FLOWERS appears as a prominent legend, accompanied by the encrypted sequence XOUV in the field. |
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| Additional information |
Tommy Flowers, the GPO engineer who built Colossus at Bletchley Park — the world's first programmable electronic computer — spent £1,000 of his own money completing it after the government refused full funding. He was never reimbursed. Tristan da Cunha, a British Overseas Territory with a population under 250, issues coins primarily for the collector market rather than circulation, making this effectively a commemorative medallion in coin form.