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Results for “intaglio color calibration”
Libya 1971 Central Bank of Libya 10 Dinars color trial specimen with Omar al-Mukhtar portrait, pre-issue intaglio color calibration, specimen overprint, PMG 64 choice uncirculated

Libya 1971 - Central Bank of Libya 10 Dinars Color Trial Specimen (Omar al-Mukhtar Portrait, Pick 37cts)

Color trial specimens occupy a critical position within the banknote production sequence. They are not presentation pieces and not substitutes for issued notes, but technical print evaluations pulled during the final calibration of the intaglio face plate and associated tint stones. Their purpose was to test color harmony, ink density, and registration behavior under production conditions before full authorization of the circulating issue. Read more →

LibyaColor Trial Specimen197110 DinarsPMG 64 Choice Uncirculated (Top Population) Color TrialProduction ProofPre-Issue Print StageSingle Punch HolePunch CancelledIntaglio Color CalibrationSpecimen Of No ValueControl SerialOmar al-MukhtarPost Monarchy Currency ReformLibyan Arab RepublicRevolutionary Era IconographyCentral Bank Of LibyaLibya19711971–1972Pick 37ctsPick 37Top PopMuseum GradeR9 Extremely RareUnique
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Portugal 50 Mil Réis front progressive proof, ND (1917), Pick 110pp1, PMG 25 EPQ

Portugal 1917 - Banco de Portugal 50 Mil Réis Front Progressive Proof (Pick 110pp1)

Front progressive proof for the Banco de Portugal 50 Mil Réis, printed in a single intaglio color to test composition and line fidelity before the final multi-color stones were prepared. Without underprint or overprint, it exposes the engraver’s hand-the bare guilloche network and portrait cartouche that later defined the completed note. PMG 25 EPQ Very Fine.

Luxembourg 1970 100 Francs color trial specimen serial A000000 33 with diagonal red SPECIMEN overprint and two punch holes, Pick 56cts, PMG 58 EPQ Choice About Uncirculated

Luxembourg 1970 - 100 Francs Color Trial Specimen (Pick 56cts)

Color trials such as this were produced to test multiple variables simultaneously, including ink density, interaction between intaglio engraving and offset background layers, and legibility under both manual inspection and machine processing. Within the Belgian Luxembourg Economic Union framework, maintaining clear denomination recognition across mixed national issues was a critical requirement, making color differentiation a key functional parameter rather than a purely aesthetic choice.

Color Trial Specimen Color Trial Alternative Color Blue Color Trial Intaglio engraving Color differentiation testing
United States 1970s Giori Test Note Jefferson Center black front green back inverted red serial number CT68666 watermark PMG 64 EPQ Choice Uncirculated

United States ca. 1970s – Giori Test Note – Jefferson Center, Black Front / Greenback Inverted Experimental Serial With Watermark

Experimental intaglio test note printed around the 1970s by the Bureau of Engraving and Printing on the Giori multicolor press system. Named for engineer Giovanni Giori, these sheets were used to evaluate multi-plate registration, color density, and press alignment on machinery that would later define modern currency production. The design known as the Jefferson Center joins engraved portraits of Abraham Lincoln, Thomas Jefferson, and Ulysses S. Grant beneath a partial UNITED STATES OF AMERICA banner serving as a calibration reference.

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