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Die Deterioration Doubling
{{numismatics Die deterioration doubling (DDD) is a common form of mint-made error on many United States and Canadian coins that results from degradation of the die used to strike the coin. Due to a combination of improper preparation and treatment of the dies, excessive wear, and overuse, die deterioration doubling has occurred on nearly every series issued by the US mint in recent times. Certain coins are more susceptible to it than others, due to various factors, but it does occur on most series of coins. Causes Annealing Errors During the annealing process of die making, two main errors can occur, resulting in less than perfect dies. It is impossible to tell without expensive and lengthy tests whether these errors occurred, but they will lead to significantly weaker dies and a higher tendency to deteriorate quickly. The first thing which can happen to a die in this process what metallurgists call decarburization. Decarburization is the result of an improper mix of metal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DDD Closeup
DDD or Triple D may refer to: Science and medicine *Defined daily dose, a World Health Organization statistical measure of drug use *Degenerative disc disease, a common disorder of the lower spine *Dense deposit disease, the preferred name for Membranoproliferative glomerulonephritis Type II *Dichlorodiphenyldichloroethane, a breakdown product of DDT *Dual pacing, dual sensing and dual response modes of a pacemaker *Depersonalization-derealization disorder, a psychiatric disorder involving feelings of oneself or the world being unreal, distant, or detached Computers and technology *Data Display Debugger or GNU DDD, a popular graphical user interface for command-line debuggers * Digital Divide Data, a social enterprise providing disadvantaged youths in Cambodia, Laos and Kenya with IT education and training *Direct distance dialing, a method for telephone subscribers to call long-distance numbers without operator assistance *DDD, the SPARS code for a CD that was recorded, mixed, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silver
Silver is a chemical element; it has Symbol (chemistry), symbol Ag () and atomic number 47. A soft, whitish-gray, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, and reflectivity of any metal. Silver is found in the Earth's crust in the pure, free elemental form ("native metal, native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc Refining (metallurgy), refining. Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes bimetallism, alongside gold: while it is more abundant than gold, it is much less abundant as a native metal. Its purity is typically measured on a per-mille basis; a 94%-pure alloy is described as "0.940 fine". As one of the seven metals of antiquity, silver has had an enduring role in most human cultures. Other than in currency and as an in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Outside Abraded Die Doubling
Outside or Outsides may refer to: * Wilderness Books and magazines * ''Outside'', a book by Marguerite Duras * ''Outside'' (magazine), an outdoors magazine Film, theatre and TV * Outside TV (formerly RSN Television), a television network * ''Outside'' (2004 film), a 2004 short film by Jenn Kao * ''Outside'' (2024 film), 2024 Philippine film * "Outside", an episode of ''One Day at a Time'' (2017 TV series) Music * Outside (jazz), an element of musical composition/improvisation * Outside Music, a Canadian music distributor and record label * Outside Studios, a British recording studio, based in England Albums * ''Outside'' (Amar album), 2000 * ''Outside'' (David Bowie album), 1995 * ''Outside'' (Burna Boy album), 2018 * ''Outside'' (CFCF album), 2013 * ''Outside'' (Shelly Manne album), 1970 * ''Outside'' (O'Death album), 2011 * ''Outside'' (Tapes n' Tapes album), 2011 * ''Outsides'' (EP), by John Frusciante, 2013 * ''Outsides'', an album by Arsenal, 2005 Songs * "Ou ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cent (currency)
The cent is a monetary unit of many national currencies that equals a hundredth () of the basic monetary unit. The word derives from the Latin , 'hundred'. The cent sign is commonly a simple minuscule (lower case) letter . In North America, the c is crossed by a diagonal or vertical stroke (depending on typeface), yielding the character . The United States one cent coin is generally known by the nickname "penny", alluding to the British coin and unit of that name. Australia ended production of their 1c coin in 1990, New Zealand last produced their 1c coin in 1988, as did Canada in 2012. Some Eurozone countries ended production of the 1 euro cent coin, most recently Slovakia in 2022. Symbol The cent may be represented by the cent sign, written in various ways according to the national convention and font choice. Most commonly seen forms are a minuscule letter ''c'' crossed by a diagonal stroke, a vertical line, a simple ''c'', depending on the currency (''see below' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nickel
Nickel is a chemical element; it has symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive, but large pieces are slow to react with air under standard conditions because a passivation layer of nickel oxide forms on the surface that prevents further corrosion. Even so, pure native nickel is found in Earth's crust only in tiny amounts, usually in ultramafic rocks, and in the interiors of larger nickel–iron meteorites that were not exposed to oxygen when outside Earth's atmosphere. Meteoric nickel is found in combination with iron, a reflection of the origin of those elements as major end products of supernova nucleosynthesis. An iron–nickel mixture is thought to compose Earth's outer and inner cores. Use of nickel (as natural meteoric nickel–iron alloy) has been traced as far back as 3500 BCE. Nickel was first isolated and classifie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Face Value
The face value, sometimes called nominal value, is the value of a coin, bond, stamp or paper money as printed on the coin, stamp or bill itself by the issuing authority. The face value of coins, stamps, or bill is usually its legal value. However, their market value need not bear any relationship to the face value. For example, some rare coins or stamps may be traded at prices considerably above their face value. Coins may also have a salvage value due to more or less valuable metals that they contain. Overview The face value of bonds usually represents the principal or redemption value. Interest payments are expressed as a percentage of face value. Before maturity, the actual value of a bond may be greater or less than face value, depending on the interest rate payable and the perceived risk of default. As bonds approach maturity, actual value approaches face value. In the case of stock certificates, face value is the par value of the stock. In the case of common stoc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Numismatics
Numismatics is the study or collection of currency, including coins, tokens, paper money, medals, and related objects. Specialists, known as numismatists, are often characterized as students or collectors of coins, but the discipline also includes the broader study of money and other means of payment used to resolve debts and exchange good (economics), goods. The earliest forms of money used by people are categorised by collectors as "odd and curious", but the use of other goods in barter exchange is excluded, even where used as a circulating currency (e.g., cigarettes or instant noodles in prison). As an example, the Kyrgyz people used horses as the principal currency unit, and gave small change in sheepskin, lambskins; the lambskins may be suitable for numismatic study, but the horses are not. Many objects have been used for centuries, such as Cowry, cowry shells, precious metals, Cocoa beans#History, cocoa beans, Rai stones, large stones, and Gemstone, gems. Etymology Firs ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serif
In typography, a serif () is a small line or stroke regularly attached to the end of a larger stroke in a letter or symbol within a particular font or family of fonts. A typeface or "font family" making use of serifs is called a serif typeface (or serifed typeface), and a typeface that does not include them is sans-serif. Some typography sources refer to sans-serif typefaces as "grotesque" (in German language, German, ) or "Gothic" (although this often refers to blackletter type as well). In German usage, the term Antiqua (typeface class), Antiqua is used more broadly for serif types. Serif typefaces can be broadly classified into one of four subgroups: Serif#Old-style, Old-style, Serif#Transitional, Transitional, Serif#Didone, Didone, and Serif#Slab serif, Slab serif, in order of first emergence. Origins and etymology Serifs originated from the first official Greek writings on stone and in Latin alphabet with Roman square capitals, inscriptional lettering—words carved into s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magnification
Magnification is the process of enlarging the apparent size, not physical size, of something. This enlargement is quantified by a size ratio called optical magnification. When this number is less than one, it refers to a reduction in size, sometimes called ''de-magnification''. Typically, magnification is related to scaling up visuals or images to be able to see more detail, increasing resolution, using microscope, printing techniques, or digital processing. In all cases, the magnification of the image does not change the perspective of the image. Examples of magnification Some optical instruments provide visual aid by magnifying small or distant subjects. * A magnifying glass, which uses a positive (convex) lens to make things look bigger by allowing the user to hold them closer to their eye. * A telescope, which uses its large objective lens or primary mirror to create an image of a distant object and then allows the user to examine the image closely with a smaller ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Metal
A metal () is a material that, when polished or fractured, shows a lustrous appearance, and conducts electrical resistivity and conductivity, electricity and thermal conductivity, heat relatively well. These properties are all associated with having electrons available at the Fermi level, as against nonmetallic materials which do not. Metals are typically ductile (can be drawn into a wire) and malleable (can be shaped via hammering or pressing). A metal may be a chemical element such as iron; an alloy such as stainless steel; or a molecular compound such as polythiazyl, polymeric sulfur nitride. The general science of metals is called metallurgy, a subtopic of materials science; aspects of the electronic and thermal properties are also within the scope of condensed matter physics and solid-state chemistry, it is a multidisciplinary topic. In colloquial use materials such as steel alloys are referred to as metals, while others such as polymers, wood or ceramics are nonmetallic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bust (sculpture)
A bust is a Sculpture, sculpted or cast representation of the upper part of the human figure, human body, depicting a person, person's Human head, head and neck, and a variable portion of the chest and shoulders. The piece is normally supported by a plinth. The bust is generally a portrait intended to record the appearance of an individual, but may sometimes represent a type. They may be of any List of art media, medium used for sculpture, such as marble, bronze, terracotta, plaster, wax or wood. As a format that allows the most distinctive characteristics of an individual to be depicted with much less work, and therefore expense, and occupying far less space than a full-length statue, the bust has been since ancient times a popular style of life-size portrait sculpture. A sculpture that only includes the head, perhaps with the neck, is more strictly called a "head", but this distinction is not always observed. Display often involves an integral or separate display stand. The A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hub Doubling
Doubled die (also known as hub doubling) is a term in numismatics used to refer to a duplication of design elements on a working die created due to a misalignment of the die or hub during the hubbing process. Strength of the doubling can vary from very slight and isolated to extreme and widespread. The exact cause of the doubling can also vary, which is why a class system was created to outline the known and hypothesized causes. Doubled die varieties, when noticeable to the naked eye or occur in a popular coin series, are extremely popular with collectors and can be worth a large premium over the same coin without the doubling. The most popular doubled die variety would be the 1955 doubled die cent, 1955 US cent doubled die which typically sells for over $1000 at auction. This term is commonly misspelled "double die." Classes of doubled dies Doubled dies are created when the hub imprints an additional, misaligned image onto a die. The many ways this misalignment of images can ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
