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Doubled die coins are mainly created by a defective hub which is used to create many dies for the minting process. Collectors classify doubled dies as DDO (doubled die obverse coins), DDR (doubled die reverse) and OMM (over mint mark).
Virginia 50 State quarter, the most minted quarter in the series The topic of this article may not meet Wikipedia's general notability guideline . Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention.
June 7, 2001 – June 21, 2001 50¢ U.S. Capitol Visitor Center half dollar: Original capitol building within an outline of the present day Capitol 16 stars and the inscription "32 Senators; 106 House Members" Cu 92%, Ni 8% Authorized: 750,000 (max) Uncirculated: 99,157 P Proof: 77,962 P 2001 $1: U.S. Capitol Visitor Center dollar
Like other coins, the value of errors is based in part on rarity and condition. In general, lower denomination errors are less expensive than higher denomination errors simply because more such coins are minted resulting in available errors. Due to improvements in production and inspection, modern errors are more rare and this impacts value. [3]
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Below are the mintage figures for the United States quarter up to 1930, before the Washington quarter design was introduced. The following mint marks indicate which mint the coin was made at (parentheses indicate a lack of a mint mark): P = Philadelphia Mint. D = Denver Mint. S = San Francisco Mint. W = West Point Mint. O = New Orleans Mint. CC ...
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On 5 January 1975, the 12-bit field that had been used for dates in the TOPS-10 operating system for DEC PDP-10 computers overflowed, in a bug known as "DATE75". The field value was calculated by taking the number of years since 1964, multiplying by 12, adding the number of months since January, multiplying by 31, and adding the number of days since the start of the month; putting 2 12 − 1 ...