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:
“Generally speaking, the errors in religion are dangerous; those in philosophy only ridiculous.”
—David Hume (1711–1776)
“I shall do less whenever I shall believe what I am doing hurts the cause, and I shall do more whenever I shall believe doing more will help the cause. I shall try to correct errors when shown to be errors; and I shall adopt new views so fast as they shall appear to be true views.”
—Abraham Lincoln (1809–1865)
“Of all the errors which can possibly be committed to the education of youth, that of sending them to Europe is the most fatal. I see [clearly] that no American should come to Europe under 30 years of age.”
—Thomas Jefferson (1743–1826)