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Knowledge / Errors / Gums

Gum Error: philatelic term for a deviation caused by a gum error

Gum Colour Error: deviation from the intended gum colour caused by an error

Design Print on Reverse: postage stamp with design print on reverse instead on front

Missing Gum: postage stamp without gum caused by an error

Vertical Instead of Horizontal Ribbed Gum: postage stamp with 90 degrees rotated ribbed gum

Horizontal Instead of Vertical Ribbed Gum: postage stamp with 90 degrees rotated ribbed gum

Bark Gum: unregular thick and grazed gum

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