Stamp Perforation

Perforation are holes punched between stamps to make separating easier. A Perforation Number (such as 10 or 11x10) indicates the number of holes in a space of 2 centimeteres along the edge of a stamp.

The difference between stamp perforations

Perforation are holes punched between stamps to make The first watermark that appeared on U.S. postage stamps was the "double-line USPS", for "United States Postage Stamp". Period of use 1895-1910.the number of holes in a space of 2 centimeteres along the edge of a stamp.

The difference between stamp perforations