Catalog
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| Issuer | Narodowy Bank Polski (National Bank of Poland) |
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| Year | 2001 |
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| Currency | Fourth Zloty (1995-date) |
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| Obverse description | At centre, the Polish state eagle — displayed, crowned, with wings spread and talons extended — rendered in high relief against a mirror-polished field. To the lower left and lower right of the eagle, two detailed close-up depictions of butterfly wing scales are shown in frosted relief within rectangular panels, previewing the reverse subject. The circular legend RZECZPOSPOLITA POLSKA arcs along the upper rim, while the date 2001 appears beneath the eagle and the denomination ZŁ 20 ZŁ is inscribed along the lower field. |
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| Reverse script | Latin |
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| Additional information |
Part of NBP's long-running nature series, this issue appeared at a pivotal moment — Poland was deep in EU accession negotiations, and the central bank was producing commemorative silver at an unusually high pace, in part to build foreign exchange reserves and international collector interest ahead of zloty transition uncertainty. The swallowtail butterfly was a deliberate choice: protected under Polish law since 1952, Papilio machaon had become a symbol of domestic conservation policy at a time when harmonizing environmental regulations with EU standards was politically contentious.