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Luxembourg 1970 100 Francs calibration specimen serial D170001 with blue registration gridlines and handwritten printer annotation, Pick 56s

Luxembourg 1970 - 100 Francs Archival Gridlines Calibration Specimen Serial D170001 (Pick 56s)

The presence of a live serial number combined with calibration gridlines distinguishes this piece fundamentally from standard A000000 specimen issues. Rather than serving as a presentation or archival reference copy, this note represents a working calibration sheet-pulled during production to verify accuracy before full issuance. Read more →

calibration sheet
LuxembourgSpecimen1970100 FrancsPMG 65 EPQ Gem Uncirculated Specimen100 FrancsD170001Live SerialCalibration SheetGridlinesRegistration GridPrinter AnnotationHandwritten AnnotationGrand Duke JeanLuxembourg banknote designGuilloche security patternProduction calibrationPre-production controlThomas De La RueDe La RueTDLRLuxembourg monetary systemBelgian Luxembourg Economic UnionProduction workflowHistoryLuxembourg1970Pick 56sPick 56aPMG 65 EPQGem UncirculatedMuseum GradeAnnotationsHandwritten Annotations
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New Zealand 1907–1926 Bank of New Zealand £20 Blue audit-range serial-prefix specimen with dual control numbers, Bradbury Wilkinson & Co., PMG 55 AU, Pop 1/1, R9 Extremely Rare

New Zealand 1907–1926 - Bank of New Zealand £20 Blue Serial-Prefix Audit Specimen (Pick S194s)

A unique high-denomination Bradbury Wilkinson audit-range specimen and the rarest surviving document from New Zealand’s private-banknote era, the £20 Blue (Pick S194s) represents the apex of BNZ’s color-coded denomination hierarchy. This specimen is not a generic zero-serial example: it carries dual live serials (No. 061001 and No. 066000), identifying it as an internal audit-range piece used by Bradbury Wilkinson for plate alignment, tint calibration, and numbering verification during the official approval process.

Audit Control Sheet
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.

United States 1970s COPE Experimental Test Note serial A82432955A blank format PCGS 65 PPQ Gem New

United States ca. 1970s – C.O.P.E. Experimental Test Note Serial A82432955A

The note itself carries no engraved design beyond the twin black-ink serials A82432955A applied in standardized placement. Its plain surface was used to monitor ink adhesion, roller alignment, and sequential numbering precision under mechanical feed. Each sheet was passed through experimental overprinting heads simulating real production conditions but without a printed plate image, allowing engineers to isolate calibration variables independent of design complexity.

Serial Number Calibration
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