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Knowledge / marginal prints / printing technical note

Printing date: Indication of the date of the stamp production mostly on the edge of the sheet (date corner)

Printer information: Name of the company responsible for printing this postage stamp

"Above" marking: Marking on the edge of the sheet for the purpose of determining whether the poorly visible green negative pressure has been applied the right way round

Sheet cutting mark: Marking on the edge of the sheet for the exact trimming of printed sheets into smaller units

Sheet counter / sheet number: consecutive number on the edge of the sheet for counting the number of stamped sheets printed

Protective strip: Decorative strip in the edge of a printed sheet to protect the stamp clich├ęs, which are particularly stressed there, from wear and damage during printing

Advertising bar: the edge of the sheet printed with commercial advertising instead of a protective bar

Type of printing plate: flat printing plate (plate printing) or printing plate curved around a cylinder (roller printing) with roller lines

Form number: Identification of different printing forms of one and the same stamp value for the printer by numbers on the edge of the sheet

Plate number: Identification of different printing plates of one and the same stamp value for the printer

this six color stamp was printed from six plates which is why there are six
There are plate numbers on the margin of the sheet

House order number: (HAN) consecutive order number on the edge of the sheet as internal identification of the printer

Register cross: Marking on the edge of the sheet for the exact alignment of the individual printing plates in multi-color printing

Color identification: color bar on the edge of the sheet to control the automatically controlled ink feed

Printer symbol: Name or abbreviation on the edge of the sheet that indicates the printer working on the machine for the purpose of quality control

GC note: inferior, porous, wood pulp containing paper with a rough surface which was used in France during World War I (pour Grande Consommation = for mass consumption)

Control bars: Signal marks for the electronic guidance of the toothing machine

Attachment mark: Marking on the edge of the sheet which should facilitate the correct application of the sheet in the perforation machine

Perforation puncture: Marking on the edge of the sheet for precise positioning of the sheet in the perforator