Canadian phosphor tagging has been classified into Tag Types.
Tagging errors, the result of either shifts of the tagging, shifts of the
perforations (or die cutting on self-adhesive stamps), or the lack of tagging,
result in sub types of these major classifications:
Winnipeg tagging | |
W1: one tag bar down the middle of the stamp.
W2: tag bars down the vertical perforations with the result being two half-tag bars on a stamp. W3: six tag bars across the pane of ten stamps, on alternate columns, including the left and right selvedge. W4: five tag bars across the pane of ten stamps, on alternate columns, ignoring the left and right selvedge. W5: pale tag wash over entire stamp.
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General tagging | |
G1: pale tag wash over entire
stamp.
G2: tag bars down the vertical
perforations with the result being two half-tag bars on a stamp.
G3: tag bars down the vertical perforations and a
tag bar down the middle of a stamp. The result is three vertical bars per stamp.
G4: tag bars on all four sides of a stamp.
click for images of G4 errors
G5: two thin, short tag bars applied inside the
stamp.
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