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| 背面描述 | Purple intaglio-style print on white paper, mirroring the obverse layout. A classical female figure vignette occupies the right, alongside a vertical guilloche band and ornate scrollwork borders. The numeral '20' appears at upper left and in a circle at lower right; a solid magenta overprint reading 'TEST NOTE' is applied to the centre lower area. Legends listing machine applications are printed at left. |
| 背面铭文 | 20 NO VALUE WERTLOS SANS VALEUR NOT VALID TENDER STERLING Banknote counting, verifying and sorting machines. Cash desks and dispensing systems. ATMs TEST NOTE TEST 20 |
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SPC International operated as a specialist security printing consultant and test note producer, supplying sample and trial pieces to central banks and currency procurement bodies evaluating new printing contracts or security feature packages. These notes were never intended for circulation — they exist to demonstrate printing quality, paper specification, or authentication technology to a procurement audience, not the public.
Provenance on SPC test material is often murky; pieces surfaced through trade channels after company restructuring or estate dispersals rather than through formal deaccession.