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| 裏面の説明 | Central vignette of traditional Mauritanian musical instruments — including a tidinit lute and a tbal drum — alongside a decorative silver teapot, all rendered in fine intaglio at left of centre against a purple and gold guilloche underprint. The large numeral '50' appears in bold intaglio at centre right, with the transparent polymer security window at far right bearing the open-book motif mirroring the obverse. Geometric and arabesque patterning fills the background across the full width of the note. |
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| 偽造防止技術 | Polymer substrate, Transparent window, Optically variable ink |
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Mauritania's switch to polymer for this series marked a significant logistical bet in a country where heat, sand, and humidity accelerate the destruction of cotton-fiber notes far faster than in temperate climates — the Saharan and Sahelian conditions that cover most of the country's territory are among the most punishing on earth for paper currency. Guardian® substrate, produced by CCL Secure, was a practical answer to a real problem.
Giesecke+Devrient's Leipzig facility has handled Mauritanian production across multiple series. P#22 is the 50 Ouguiya denomination within the 2017 polymer issue, which updated a currency first introduced in 1973 when Mauritania exited the West African CFA franc zone.