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	Machine Postmarks	Margin Prints	Meter Stamps	Overprints	Pencancel- 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 / Print Substrates

Paper Error: philatelic term for a deviation caused by a paper error

Paper Colour Error: deviation from the intended paper colour caused by an error	Mixed Up Papers: postage stamp caused by an error printed on a different paper as intended (e. g. with watermark)

Horizontal Instead of Vertical Laid Paper: postage stamp caused by an error printed on 90 degrees rotated laid paper