Canada #640 G1aL 8c Multicoloured, Globe and Plant, 1974 Agricultural Education Issue, a Very Fine Used Single, on HB Paper Showing 1-Bar Tag Error, Resulting From Misperf

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A well centered (top to bottom) and very fine used single of the 8c stamp from the 1974 Agricultural Education issue, printed on HB paper, showing the scarce 1-bar tag error, consisting or a single 4 mm tag bar down the  left side of the stamp. This results from a significant leftward shift of the vertical perforations. 

Unitrade does not list this type of tagging variety, but Rose does, and lists the stamp for $25 for a 1-bar tag resulting from a tagging shift. Misperfs are typically in the same price range for this degree of shift. The stamp offered here grades 80 as follows:

Centering/margins: 40/60 
Paper freshness: 5/5 
Colour: 5/5 
Impression: 5/5 
Absence of visible paper flaws: 5/5 
Perforations: 10/10

Cancellation: 10/10