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Results for “serial number calibration”
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. Read more →

United StatesTest Note1970Test NotePCGS 65 PPQ Gem New United StatesCOPE Test NoteExperimental1970Serial Number CalibrationBureau of Engraving and PrintingPCGS 65 PPQCurrency Overprinting and Processing Equipment
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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

The front is printed in deep black on watermarked paper and carries an experimental red serial number, CT68666, inverted relative to the design. Serial numbering on Giori tests is unusual; inversion shows the sheet was fed intentionally in reverse for mechanical calibration of numbering direction and feed sequencing. Bars across the portraits act as alignment guides for optical measurement during press setup.

Inverted Serial Experimental Serial
United States Series of 1928C Five Dollars Legal Tender Note with red Treasury seal and red serial numbers, GA block, Friedberg 1528, graded PMG 66 EPQ Gem Uncirculated, showing strong centering, vivid red seal color, and crisp engraving detail.

United States 1928C - Five Dollars Legal Tender Note Red Seal, Friedberg 1528, GA Block, PMG 66 EPQ Gem Uncirculated

The vivid red Treasury seal and matching red serial numbers distinguish Legal Tender Notes from contemporary Federal Reserve issues. Unlike Federal Reserve Notes, these obligations were direct liabilities of the United States Treasury itself. The bold red elements contrast sharply against the deep green engraving of the portrait of Abraham Lincoln, whose dignified likeness anchors the obverse. The reverse presents the engraved Lincoln Memorial vignette, a compact yet intricate rendering that balances architectural precision with classical symmetry.

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)

Archival calibration specimen of the 1970 one hundred francs issue of the Grand Duchy of Luxembourg, produced during the Belgian Luxembourg Economic Union period and printed by Thomas De La Rue & Company, London. Unlike standard specimen notes bearing placeholder serials, this example carries a live production-format serial number D170001, linking it directly to an active print batch within the manufacturing process.

Live Serial Calibration Sheet Production calibration
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