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 / Roulettings

Rouletting Error: philatelic term for a deviation caused by a rouletting error

Missing Rouletting: postage stamp without rouletting at all sides caused by an error

Partly Missing Rouletting: postage stamp with missing rouletting at one or more, but not at all four, sides caused by an error

Pair With Missing Rouletting in Between: pair with missing rouletting in between caused by an error

Double Rouletting: postage stamp twice rouletted at all sides

Partly Double Rouletting: postage stamp twice rouletted at one or more, but not at all four, sides

Rouletting Size Error: postage stamp with a different number of rouletting elements caused by an error