A pattern coin is a coin produced for the purpose of evaluating a proposed coin design, but which was not approved for general circulation. Generally, these coins are of interest only to collectors of pattern coins. However, pattern coins that are later selected for normal production, such as the United States 1856 Flying Eagle […]

The okito box is a cylindrical box fitted to the size of a coin, used to perform coin magic. A coin placed in the box seems to vanish, appear, penetrates the box, and so forth.

Rare Coin Appraisers and Coin Collecting Rare coin appraisers know the market and are not necessarily purchasers of coins, therefore […]

A medal-coin or non-circulating legal tender (NCLT) coin is regarded as legal tender, but it does not circulate for the following reasons:

The intrinsic value exceeds the denominational value.

The currency unit is not in common use.

The coin is issued in proof only.

The coin is sold to collectors at a premium above the […]

Side by Side may refer to:

Side By Side (band), an American hardcore punk band

“Side by Side (1927 song)”, a song by Harry Woods, popularized by Kay Starr

Side by Side (pricing game), a pricing game on the American television game show The Price Is Right

Side by Side (game series), a racing game series by Taito Corporation […]

The narrow money supply or the monetary base (MO) is the term used to describe notes and coins held by the public and notes and coins held by the banking system as reserves against withdrawals.

Grading Rare Coins NCI is regarded as a very consistent service; two professional coin appraisers grade every coin. Yet, the prices […]

In mathematics, the Stoneham numbers are a certain class of real numbers, named after mathematician R. Stoneham. For coprime numbers b, c > 1, the Stoneham number αb,c is defined as

<math>\alpha_{b,c} = \sum_{n=c^k>1} \frac{1}{b^nn} = \sum_{k=1}^\infty \frac{1}{b^{c^k}c^k}</math>

It was shown by Stoneham in 1973 that αb,c is b-normal whenever c is an odd prime and b […]

Regular issue coinage is a term that distinguishes coins created for commerce from commemorative coins. Regular issue coins are normally produced in relatively large numbers, and are primarily meant to be used as pocket change, not collected. Business Strike is the technical term for regular issue coinage.

Because special collector coins, such as proof coinage, are […]