Engraved intaglio banknotes are the apex of early-20th-century security printing: raised steel-plate lines, rose-engine guilloché rosettes, portrait cartouches, and microprint, pulled onto warm cotton-rag paper. This system honors that craft in its documented aged, toned state — security green line work reading against a darkened olive-tan field rather than fresh white. Every surface speaks the visual language of money and anti-counterfeiting.