4p cobalt blue

Water-activated gum
First seen: Jul 26, 1988

 

Harrison & Sons / Photogravure


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PaperOther identificationIssue dateSourceGum
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ACPScreened valueJul 26, 1988SheetDex
ACPScreened valueOct 10, 1989Coil (horiz), multi-valueDex
OFPPJan 31, 1995Coil (horiz)Dex

4p cobalt blue

Elliptical perf
First seen: Dec 14, 1993

 

Enschede / Gravure

PaperOther identificationIssue dateSourceGum
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2-band (9.5mm blue) phosphor
OFNPNov 2, 1995SheetPVA
2-band (9.5mm yellow) phosphor
OFNPAY2 phosphorDec 14, 1993SheetPVA
2-band (9mm violet) phosphor
OFNPAug 1, 1996SheetPVA

4p cobalt blue

EME image
First seen: May 27, 1997

 

Gravure

PaperPrinterOther identificationIssue dateSourceGum
Pic?
Checklist
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OFPPDe La RueMay 22, 2000Mini sheetPVA
2-band (9mm blue) phosphor
OFNPHarrison & SonsMay 27, 1997SheetPVA
2-band (9mm violet) phosphor
OFNPDe La RueDull, medium, bright paperApr 1, 2003SheetPVA

Multi-value coil


Yellow vs. blue phosphor bands

(i-Phone photograph)



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