Errors documented by Stanley Gibbons (SG). Pane Number UMFB2 or Stamp Number followed by small letter a-z
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.
Right Phosphor Shift
Left Phosphor Shift
PIPP, PIPI, PPPI
P = Perforations, I = Straight Cut
WR = Incorrect Rates, CR = Correct Rates
For Identification of Perforations, the Booklet must be viewed with the margin at the left. Right Margin Booklets must be viewed upside down.
Phosphor Bands By Deegam Short Bands described by Deegams
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.