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GB Stamps, Errors & Flaws
Errors in QE ll Stamps
of Great Britain
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Glossary of Flaws & Errors in United Kingdom Stamps

SG:
Stanley Gibbons Error Reference
ND:
Newly Discovered Error or Not Documented Reference
BMB or RMB
Black or Red Mark on the Booklet
STAMPa
Errors documented by Stanley Gibbons (SG).
Pane Number UMFB2 or Stamp Number followed by small letter a-z
STAMP-xe1-
New Errors Found and documented by the collector. 
Pane Number VB3d followed by -xe1 to -xe999
STAMP-yRPS
Right Phosphor Shift
STAMP-yLPS
Left Phosphor Shift
PIPP, PIPI, PPPI
P = Perforations, I = Straight Cut
WR, CR
WR = Incorrect Rates, CR = Correct Rates

Perforation Margins

For Identification of Perforations, the Booklet must be viewed with the margin at the left.
Right Margin Booklets must be viewed upside down.
E1 Perforation Margin
E1a Perforation Margin
E1b Perforation Margin
E1c Perforation Margin
E2 Perforation Margin
E2a Perforation Margin
E2b Perforation Margin
P1 Perforation Margin

Phosphor Bands position
described by Deegams

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Due to many Varieties and Flaws:  Deegam, Modern British Philatelic Circle (MBPC), Machine Collectors Club (MCC) and Stoneham (STN) also contributed. To summarise their contributions:
Ribbed Gum (Connoisseur Catalogue.
Phosphor Bands varieties e.g. Short bands. Inset Bands (Deegam Catalogue).
Reference Numbers for Booklets and Panes (MBPC, MCC Catalogue, Deegam & Stoneham Catalogues ).
Perforation Types for panes and margins (MBPC, MCC Catalogue, Deegam & Stoneham Catalogues).
Screened Values (Connoisseur Catalogue).

In addition to above, during printing of stamps, phosphor bands shifted to the right or left. 
Our online shop have all the images of the Errors,  Flaws and Varieties. 

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