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

Knowledge / Errors / Others


Firmly Sticking Postage Stamp: self-adhesive postage stamp which can not striped without damages caused by an error	Double Transfer: postage stamp that shows evidence of a (partly) duplication in the design	Chalky Overprint on Reverse: postage stamp with chalky overprint on reverse instead on front

Missing Chalky Overprint: postage stamp without chalky overprint caused by an error	Double Chalky Overprint: postage stamp twice chalky overprinted	Missing Pre-Cancellation: postage stamp without pre-cancellation caused by an error