Errors
As is inevitable for a mechanical process like perforation, many things can go wrong. Blind perfs are common, occurring when a hole is not completely punched out, as are offcenter perfs that cut into the design of the stamp, sometimes very badly. Occasionally pairs or larger groups of stamps may be imperforate between meaning that they are not separated on all sides. Although it is very common to have different gauges of perforation horizontally and vertically, in rare circumstances a stamp may have different perforations on opposite sides; in the case of US stamps only a handful of these are known to exist. The various types of perforation errors are collectively known as misperfs.
Read more about this topic: Postage Stamp Separation
Famous quotes containing the word errors:
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—Richard Steele (1672–1729)
“The weak have one weapon: the errors of those who think they are strong.”
—Georges Bidault (1899–1983)
“Science in the modern world has many uses; its chief use, however, is to provide long words to cover the errors of the rich.”
—Gilbert Keith Chesterton (1874–1936)