A T Ms	Coatings	Hand Postmark Cancellations	Margin Watermark	Perforations	Postage Stamp Burelages	Postage Stamp Design Prints	Postage Stamp Overprints	Postage Stamp Reverse Prints
Postal Stationeries		Postal Stationery Design Prints	Postal Stationery Overprints	Print Substrates	Punchings	Postal Shipments	Stamp Impressions	Combinations

Knowledge / Safety Measures / Others / Perforations

Perforation safety measure: safety measures made as perforation

Elliptical perforation: perforation with an arch-shaped hole to avoid forgeries (syncopated perfs)