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The Canada 1977 Christmas 12¢ stamp has a few varieties of printing and perforation shifts that we would like to feature here for your collecting interest and research. These varieties were offered in a catalogue dated 8 December 2008.

To begin with, here is an enlarged image of a normal stamp for comparison.

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Canada #742 T2
1977 Christmas 12¢ ONE BAR TAG (G2al) at left (position indicated by grey tabs above and below image) due to perforation shift. Vertical perfs are shifted 2.5 mm to left. Only one sheet of 50 thought to exist.
CS Unlisted, Peters $75.00

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Canada #742iv — as listed in Unitrade catalogue
1977 Christmas 12¢ DOUBLE PRINT of BLACK INSCRIPTIONS showing second impression of "CHRISTMAS NOEL JESOUS AHATONHIA". Only a few used singles found (as this one is).
CS $50.00

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Canada #742iv var2
1977 Christmas 12¢ TRIPLE PRINT of BLACK INSCRIPTIONS showing 3 impressions of "CHRISTMAS NOEL JESOUS AHATONHIA". Misregistration of black making picture blurry.
CS Unlisted

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Canada #742iv T3
1977 Christmas 12¢ DOUBLE PRINT of PURPLE, BLUE, & GREEN plus QUADRUPLE PRINT of BLACK INSCRIPTIONS at top. ONE-BAR TAG (G2aR) (position indicated by grey tabs above and below image) due to resulting printing shift. Only 1 sheet of 50 recorded.
CS Unlisted, Peters $900.00

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Canada #742iv T3var
1977 Christmas 12¢ DOUBLE PRINT of PURPLE, BLUE & GREEN plus QUADRUPLE PRINT of BLACK INSCRIPTIONS at top. Almost ONE-BAR TAG (G2aR) (position indicated by grey tabs above and below image) due to resulting printing shift. Only 1 sheet of 50 recorded.
CS Unlisted, Peters $900.00

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In the article, "Peters" refers to Del Peters, a collector of tagging errors, who teamed up with Robin Harris and John Jamieson to produce an online database of such errors hosted on the Adminware website. Besides listing all known tagging errors, the database illustrates the various types of errors and the nomenclature (such as "G2al") used to identify and catalogue them.

"CS" refers to the Unitrade Specialized Catalogue of Canadian Stamps.