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Results for “experimental serial”
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. Read more →

United StatesTest Note1970Test NotePMG 64 EPQ Choice Uncirculated United StatesGiori Test NoteJefferson Center1970Black FrontGreenbackInverted SerialExperimental SerialWatermarkPMG 64 EPQ
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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

Blank-format experimental note printed by the Bureau of Engraving and Printing during the 1970s as part of internal testing for the C.O.P.E. (Currency Overprinting and Processing Equipment) program. This machinery represented a major modernization step in U.S. currency production, automating serial numbering, seal application, and sheet cutting for the first time on a fully integrated system.

Experimental Serial Number Calibration
New Zealand 1975 1 Dollar Replacement Star Note with R.L. Knight signature, Pick 163c star, serial Y91304453 star, graded PMG 66 EPQ Gem Uncirculated.

New Zealand 1975 - 1 Dollar Knight Signature Replacement Star Note Serial Y91304453* (Pick 163c*)

What defines this note is its replacement status. The serial Y91304453* ends with the star suffix, the crucial identifier showing that the piece was not part of ordinary sequential output but part of the replacement pool used to stand in for notes rejected during production. In practical terms, the star transformed an otherwise standard one-dollar note into a controlled substitute note within the printing workflow. That distinction is not decorative or incidental. It reflects the mechanics of quality control, spoilage management, and serial accounting within modern banknote manufacture. Replacement notes therefore document the hidden corrective side of currency production: not the intended run alone, but the safeguards that ensured finished consignments remained complete and orderly.

Libya 1971 Central Bank of Libya 10 Dinars specimen with Omar al Mukhtar portrait, red specimen overprint, zero serial controls, final approved design state, PMG 58 EPQ

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

This specimen represents the official pre-issue specimen of the Central Bank of Libya 10 Dinars note introduced in 1971, the first high-denomination issue of the Libyan Arab Republic following the abolition of the monarchy. Bearing the red SPECIMEN overprint and zero control serials, the note documents the final approved design state immediately before full circulation printing commenced.

Zero Serial Control
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