GB Stamps, Errors & Flaws

Great Britain Stamps & Errors 

Glosssary

BMB or RMB
Black or Red Marker 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. 
SG-Pane Number followed by -xe1 to -xe999 
xe Numbers are label only. The numbers can denote different errors/flaws.
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 By Deegam
Short Bands described by Deegams

Placeholder Picture

Stamps have 4 types of flaws on them according to MBPC: 
V - Large Visible flaw seen by the naked eye.
B - Small but readily seen
C - Very small which are seen with a magnifying Glass up to 10x
D - Minor flaws and specks

In addition to above,  Phosphor bands either shifted to the right or left. The online shop have images where they occur.