Variety Codes:
00 Normal issue
A Printing variety
BL Block
C Color-var. (shade)
CE Color-error
CM Color-missing
G Gum variety
MT Multiple-Tete Beche
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MI Multiple imperforated
MB Multiple-in bklt form
MG Perforation-gutter Pair
MO Multiple-O/P difference
MS Multiple-different stamps
O Overprint-variety(other)
OD Overprint-double
OK Overprint-inverted
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P Paper variety
U Perforation variety
UE Perforation-error
MG Perforation-gutter Pair
UP Perforation-imperf pair
UI Perforation-imperf sngl
SS Souvenir Sheet
W Watermark variety
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