Mint Mark

A mint mark is an inscription on a coin indicating the mint where the coin was produced.

Mint marks were first developed to locate a problem. If a coin was underweight, or overweight, the mint mark would immediately tell where the coin was minted, and the problem could be located and fixed. Another problem which could occur would be a dishonest mint official debasing the coin, or putting less precious metal in the coin than specified. Debasing a coin, or otherwise tampering with it, was a very serious crime, often punishable by death in many civilizations. For example, in 1649, the directors of the Spanish colonial American Mint at Potosi, in what is today Bolivia, were condemned to death for seriously debasing the coinage. The initials of the assayer as well as the mint mark were immediate identifiers when the coins were inspected.

Examples of mint marks in United States coinage include P for the Philadelphia Mint, D for the Denver Mint, S for the San Francisco Mint, and W for the West Point Mint. In the past, CC for the Carson City Mint, C for the Charlotte Mint, D for the Dahlonega Mint, and O for the New Orleans Mint were used. Most coins of the Philadelphia Mint earlier than 1980 are unmarked, the notable exceptions being wartime nickels and the Susan B. Anthony Dollars starting 1979. Currently, the Lincoln cent is the only coin that does not always have a mint mark, using a "D" when struck in Denver but lacking a "P" when ostensibly struck at the Philadelphia mint; this practice allows additional minting of the coin at the San Francisco mint ("S") and West Point mint ("W") without the use of their respective mint marks to supplement coin production without the concern of creating scarce varieties. Generally modern "S" and "W" coins do not circulate, being mostly produced as bullion, commemorative, or proof coinage.

Although the US and several other countries use the initial letter of the city for its mint marks, this practice is not universal. For instance, Germany used A for Berlin, D for Munich, E for Muldenhutten, F for Stuttgart, G for Karlsruhe and J for Hamburg.

Many mints of the world commonly use a Privy mark, which is a symbol unique to each mint. The Royal Canadian Mint commonly uses a maple leaf privy mark. The Monnaie de Paris uses many different privy marks to denote each branch mint, including a torch, cornucopia, or thunderbolt.

Many Islamic coins bear an inscription telling which mint produced the coin. This inscription is often the name of the city where the coin was minted spelled out in Arabic script.

Several Euro Coins have mint marks of their respective Mint. See Identifying marks on euro coins for more information.

Pruta

The Pruta (Hebrew: פרוטה‎, plural: prutot) was a denomination of currency in Israel prior to 1960.

The pruta was introduced shortly after the establishment of the state of Israel, as the 1000th part of the Israeli pound. It replaced the mil, which was the 1000th part of the Palestinian pound, a currency issued by the British Mandate of Palestine prior to May 1948.

The word Pruta was borrowed from Mishnaic Hebrew, in which it meant "a coin of smaller value." This word was probably derived originally from an Aramaic word with the same meaning. The Pruta was abolished in 1960 when the Israeli government decided to change the subdivision of the Israeli pound into 100 agorot. This move was necessary due to the constant devaluation of the Israeli pound, which rendered coins smaller than 10 prutot redundant.

This pruta should not be confused with the halachic pruta, which is the minimal value of money for a variety of halachic applications. Among them, the minimal value one is obligated to return if stolen, the minimal value needed to effect a marriage, and the minimal investment needed to be considered an investor (it is equivalent to 0.025 grams of pure silver).

1943 steel cent

The 1943 steel cent, also known as a steelie, was a variety of the U.S. one-cent coin which was struck in steel due to wartime shortages of copper.

Due to wartime needs of copper for use in ammunition and other military equipment during World War II, the US Mint researched various ways to limit dependence and meet conservation goals on copper usage. After trying out several substitutes (ranging from other metals to plastics) to replace the then-standard bronze alloy, the one cent coin was minted in zinc-coated steel. It was struck at all three mints; Philadelphia, Denver, and San Francisco. Coins from the latter two sites have respectively "D" and "S" mintmarks below the date.

However, problems began to arise from the mintage. Freshly minted, they were often mistaken for dimes. Magnets in vending machines (which took copper cents) placed to pick up steel slugs also picked up the legitimate steel cents. Because the galvanization process didn't cover the edges of the coins, sweat would quickly rust the metal. After public outcry, the Mint developed a process whereby salvaged brass shell casings were augmented with pure copper to produce an alloy close to the 1941-42 composition. This was used for 1944-46 dated cents, after which the prewar composition was resumed. Although they continued to circulate in the 1960s, the mint collected large numbers of the 1943 cents and destroyed them.

The steel cent is the only regular-issue United States coin that can be picked up with a magnet. The steel cent was also the only coin issued by the United States for circulation that does not contain any copper. (Even U.S. gold coins at various times contained from slightly over 2% copper, to an eventual standard 10% copper).