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Introduction Additional Stamp Impressions A T Ms Burelages Cliche Cancellations Cuts Design Prints Die-cuttings Embossings Form Prints
Gums Hand Postmarks Ink Jet Cancellations Lumines-
cences
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lations
Perforations Press Marks
Print Substrates Postal Stationeries Punches Reverse Prints Roulettings Second Overprints Separate Productions Se-tenants Sheet Stamps Silk Threads Stamp Booklets
Stamped Envelope Overprints Stamp Impressions Third Overprints Tress Rosettes Watermarks Others

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 caused by an error with design print on reverse instead on front

Missing Gum: postage stamp caused by an error without gum

Vertical Instead of Horizontal Ribbed Gum: postage stamp caused by an error with 90 degrees rotated ribbed gum

Horizontal Instead of Vertical Ribbed Gum: postage stamp caused by an error with 90 degrees rotated ribbed gum

Bark Gum: unregular thick and grazed gum caused by an error

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