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Grading canadian stamps
To recognize canadian stamps grades with the help of descriptions and pictures.
A cancellation (or cancel for short) is a postal marking applied on a postage stamp or postal stationery to deface the stamp and prevent its re-use.
Centering and margins
To determine the grade of a stamp according to its design vertical and horizontal alignment. (AVG, F, VF, XF, S).
Gum and hinge
To determine the grade of a stamp according to the gum and hinge (NH, H, LH, NG, DG, HR, HH).
Other aspect to determine the quality of a stamp according to its perforation, thickness, etc.