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| 背面描述 | The reverse presents a numismatic composition centred on historical coinage associated with Copernicus's monetary work, including the obverse and reverse of the Gdańsk szóstak (six-grosz piece), the obverse of the Elbląg szóstak, and the obverse of the Prussian (Toruń) schilling, all rendered with fine engraved detail. A schematic fragment of the heliocentric system serves as a unifying background motif, connecting the monetary imagery to Copernicus's scientific legacy. The engraver's credit inscription appears in the lower portion of the design. |
| 背面铭文 | K. MICHALCZUK DEL. SC. |
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Poland's first polymer banknote in general circulation, this 2023 issue marks a significant shift for Narodowy Bank Polski, which had previously relied on cotton-fibre substrate for all circulating denominations. The move to polymer for a commemorative-circulation 20 Złoty piece follows a global trend but carries specific domestic weight: the Polish Security Printing Works had to adapt its production lines, having built its reputation almost entirely on traditional intaglio and offset work on paper.
Michalczuk handling both design and engraving is unusual — the two roles are typically split between specialists.