Error notes are examples of paper money that somehow managed to make it into circulation, despite the obvious printing mistakes displayed on their faces (fronts) and backs. It shouldn’t be too surprising that a certain number of error notes exist. After all, the U.S. Bureau of Engraving and Printing produces more than 10 billion notes a year, so a statistically tiny number of errors is hardly an indication of lax quality standards. But that very scarcity is precisely what makes error notes so interesting to collectors.

Errors are often organized by when the error occurred during its printing and handling. U.S. paper money produced during the 20th century is printed in three waves. The first printing creates the image on the back of the note, the second printing is for the face, and the third printing adds serial numbers and seals to the face. Other errors are due to the way the paper is handled (folding and cutting errors) during any of these printings. In all cases, the more dramatic and glaring the error, the more valuable it is to collectors.

The so-called “king” of paper-money errors is a note with mismatched denominations on its face and back, which means the mistake occurred during the second printing (sometimes a mismatch error is perpetuated through the third printing, too). A less-valuable but related error is a note whose face is inverted. Double printings at any stage are also sought, evidence that a sheet has gone through the press more than once. The result is usually a note whose face, back, or overprints appear blurry, since the images are not perfectly aligned.

Lack of ink, or too much, is a relatively common error. In general, the bigger the blank spot or smear, the more valuable the error. Offset printing errors refer to those goofs that result in some of the face appearing on the back of a note, or vice versa. Notes printed out of register are also fairly common. In these situations, the image intended for the back or face of a note might appear to be cut off at the top or bottom. In fact, the error is due to the printing of the note, not its cutting.

That said, sometimes an error in cutting is exactly the problem, although such notes are only considered valuable if you can see approximately 50 percent of bottom and top halves of the face or back, stacked on top of each other like a movie projector that’s gone haywire.

Finally, errors committed on the various types of large-size notes issued from 1861 to 1928 are even more rare than the ones that have been produced since. In general, that means that an error on a large note such as a Silver Certificate will be worth more than the same error on a modern Federal Reserve Note. Still, as always, there are exceptions to this rule. For example, the value of an error found on most National Bank Notes, which were issued from 1863 to 1935, generally has more to do with the inherent rarity of that particular National note rather than the type of error on it.

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Misprint Ten(10) Dollar Bill - Like Mint Condition$1 2003a Frn Mismatch Serial Numbers Error Pcgs 67ppq Superb Gem New1977 One Dollar Bill $1 Misprint Face + Back Shift Error Federal Reserve NoteTcs ***rare*** B.e.p. Giori Test Note ***opportunity*** Exceptional Paper1988 A $10 Federal Reserve Note Inking ErrorTcs 1928 "no Letter" A/a $1 ***funnyback*** Serial A/000004011/a 4 Digit$1.00 Bill Error 1988 A From New York.$20 2004a Dallas ErroЯ Missing Seal Pcgs 66ppq SpectacularUncut Pair Giori Test Note Wash, Lincoln, Grant ,rev Designs Blank Back, Stains1995 $10 Error Note Missing 3rd Print Uncirculated Condition No Reserve Fourth Issue 10 Cent Fractional Pcgs63 - Very Rare Error Inverted Plate Number !2001 $10 Federal Reserve Note Foldover Error1977 Error Ten Dollar Note Off Set Printing On Reverse Crisp Uncirculated Giori Test Note: Reverse Designs Error Full Offset On Back1977 $20 Federal Reserve Note Error "wet Ink Transfer" Uncirculated *hucky* Blank Side Dollar Bill$1.00 1988 Very Rare&cool"mismatched Suffix"error~cherry(xf+/au)epq..1996 $20 Dollar Error Note Missing Treasury Seal Serial Ab27478803g1917 United States $1 CirculatedGiori Press Test Note Single Lincoln Washington GrantCrisp Uncirculated 1999 $10 Star Note With Cutting Error (cc#111)1985 One Dollar Printing Shipping$1 1935-a Silver Certificate Error, Fr#1608, "gutter Fold On Face", Pmg-35 Epq1974 $1 Federal Reserve Note • Inverted Overprint Type 1 • Pcgs 63ppq1977 $20 Federal Reserve Note, Major Gutter Fold Error.Fr. 1614 $1 1935-e Silver Certificate Butterfly Fold Very Fine2009 Misprinted One Dollar Bill Ink Transfer Circulated$5 1953 Silver Certificate Note - Error Gutter Fold On BackUs Error $10 Federal Reserve Note2013 $1 Dollar Star Note Dallas (rare Ink Error)1977 One Dollar Bill $1 Misprint Error Gutter Fold Error Federal Reserve Note$1 2009 Gem Cu Faux Miscut Fake Error, From Uncut Sheet$1 2009 Gem Cu Faux Mismatched And Miscut Fake Error, From Uncut Sheet1993 One Dollar Printing ShippingExtraordinary $1 1981 Star Federal Reserve Error Note! Partial Offset.Error 2006 $1 Frn District Seals Overinked ((uncirculated)) 2 Consecutive 1977 $5.00 Boston Frn- 3rd Print On Back - Choice CuError Note 2009 K Dallas X/l Ink Smear -lightly CirculatedUnc 2013 $5 Offset Note Imitation Faux False Fake Error1935 E One Dollar Printing Error Silver Shipping1969-d $1 Federal Reserve Bank Of Richmond Virginia Ink Smear ErrorError 2006 $1 Frn District Seals Overinked ((uncirculated)) 2 Consecutive 1935d One Dollar Narrow Blue Seal Silver Certificate-inverted 3rd Printing$100 1996 One Hunded Dollar Note Serial Error Misaligned Circulated1976 C-( 2 ) $2.00 Cu * Miscut + Shift Error + Over Printing * Consecutive Notes1976 L - $2.00 Cu * Misalignment Shift Error * Star Note1977 $10 Bill Richmond Federal Reserve Crisp! Vg Condition!$1 2003a Frn Cu Error Green Seal D26637401a Federal Reserve Note One Dollar 1988 One Dollar Error Note Circulated Condition Major Print Shift On Reverse1974 $1 Federal Reserve Bank Of Cleveland Ohio Eye Appealing Tranfer Error$100 1996 Error Note - Partial Offset Of Reverse On Front Fr.2175-b No Reserve!1950-b $5 Error ~ The Federal Reserve Bank Of Chicago,illinois ~ Kool Find!1935-d $1 Major Printing Errors On Blue Seal Certificate ~ Kool Find!1969 $1 Off Center Printing Reverse Error ~ Federal Reserve Bank Of Chicago,il2006 $1 C.u. Green Seal Serial Numbers Extra Heavy On The Ink Error ~ Kool Find!$1 Frn Us Collectable Currency Offset Error, Ink Dollar Bill Note Reserve Note2009 $1 One Dollar Note Misaligned Soiled Circulated A50183482a