Its a "G Note" not worth a fortune, but see http://www.coincraft.com/catalog/displayitem.asp?ID=BEB3945&mid=9&cID=181
US bills are printed in multiple passes, and sometimes a pass is accidentally missed so the parts of the image put on by that step are missing; there's also the possibility that they were printed but on the wrong side of the bill. Your best approach would be to have the bill evaluated by a dealer or appraiser who's familiar with error currency. In any case, without seeing it, a ballpark estimate for a missing seal could range anywhere from $200 to $500 depending on the specific cause of the error.
Overprints are considered to be major errors. Depending on the nature of your overprint, it could retail in the $150 to $300 range. You should get a couple of competing appraisals from dealers in error currency.
A foldover error is considered to be moderately rare. Retail values can be over $200 depending on the extent of the fold.
This sounds like an offset error and is quite valuable - maybe in the range of $200+. You need to get appraisals from a couple of dealers who specialize in error currency. An offset error happens when a sheet of paper gets stuck and doesn't go through the printing press. Ink is transferred to the opposite side of the press instead of the paper. When the next sheet gets unstuck and goes through, it picks up not just the ink it's supposed to have, but the reversed image from the opposite side of the press.
== == This is considered to be a major printing error. It can occur when a sheet of bills sticks to the paper underneath so that two sheets go through the press together, and only one side of each is printed. Generally major printing errors of this sort can go for $100 to $500 at auction. Note that bills are printed by the Bureau of Engraving and Printing which has nothing to do with the U.S. Mint. The Mint only makes coins.
A typographical error, more commonly referred to as a 'typo'.
error
It is worth quite a bit. Check with a paper money error specialist! Maybe $2000 or more.
No major mis-strikes* are known. If you have a coin that's missing a letter or number it's a common error called a filled die error. If you have something different, please post a new question with a description of the suspected error.(*) To clear up spelling and terminology, coins are minted, not printed. Bills are printed because they use paper and ink. Also, Miss Print is (I guess) the winner of a beauty contest for printers, LOL! The word is misprint.
A four letter word for error can be slip.
Mis- is a three-letter prefix meaning an error or mistake.
Error coins need to be seen, take it to a collector or dealer. NOTE: coins are struck, not printed.
An error in a printed work discovered after printing and shown with its correction on a separate sheet
Its value could be in the $100 to $200 range, but it depends on a number of factors. The bill should be examined in person by a dealer or appraiser who handles error currency. The error described is called an Inverted Overprint. It happened when the sheet of paper on which the bill was printed was accidentally put in the press upside down.
This is an uncommon error that happens when a sheet of paper on which a set of bills is printed is accidentally flipped during its passes through the printing press. Retail value depends on the bill's condition and how pronounced the printing is, but it could sell for in the $300 to $500 range.
It appears there was a typographical error in your question. A document is a written, printed, or electronic record that provides information or evidence of something, such as a contract, report, or letter. Documents are used for communication, record-keeping, and legal purposes.
A printing error is called a misprint or a typographical error. It involves mistakes in the printed material, such as incorrect text, missing words, or image alignment issues.