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

Knowledge / Mistakes / Gums

Gum Mistake: printers term for a deviation caused by a gum mistake

Gum Colour Error: deviation from the intended gum colour caused by a mistake

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

Missing Gum: postage stamp without gum caused by a mistake

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

Streak Gum: uneven put on gum with stripes or small gum-free areas

Gum With Alien Element: during the production mistaken included alien element