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Detailed information about coin type: Guinea from United Kingdom:

Coin type: Guinea
Description

The guinea is a coin of approximately one quarter ounce of gold that was minted in the Kingdom of England and later in the Kingdom of Great Britain and the United Kingdom between 1663 and 1814.

It was the first English machine-struck gold coin, originally worth one pound sterling, equal to twenty shillings; but rises in the price of gold relative to silver caused the value of the guinea to increase, at times to as high as thirty shillings; from 1717 until 1816, its value was officially fixed at twenty-one shillings. Following that, Great Britain adopted the gold standard and guinea became a colloquial or specialised term.

The name came from the Guinea region in West Africa, where much of the gold used to make the coins originated. Although no longer circulated, the term guinea survives in some circles, notably horse racing, and in the sale of rams, to mean an amount of one pound and one shilling (21 shillings) or one pound and five pence in decimalised currency.

CountryUnited Kingdom CurrencyPound Sterling (pre-decimal)
Sub-type of Sub-types
Face value21 (x Shilling)
Year produced1813 CurrentNo (demonetised 1816)
Material0.9167 Gold DesignerNathaniel Marchant
Production technologyMilled (machine-made) ShapeRound
Size (mm) Thickness (mm)
Mass (g)8.3500
Obverse

Laureate head of King George III facing right; around, GEORGIVS III DEI GRATIA.

Obverse inscription

GEORGIVS III DEI GRATIA

Reverse

At centre, a shield set within the Garter, crowned; the shield is quartered with the arms of England, Scotland, France and Ireland with inescutcheon the arms of the Electorate of Brunswick and Luneburg surmounted by the Electoral cap; motto on the Garter; HONI SOI QUI MAL Y PENSE; the base of the Garter divides the date 1813; around, BRITANNIANUM REX FIDEI DEFENSOR.

Reverse inscription

HONI SOI QUI MAL Y PENSE 1813 BRITANNIANUM REX FIDEI DEFENSOR

EdgeMilled Edge inscription

None

Guinea: Photos

Coin - 1 Guinea, George III, Great Britain, 1813
Copyright: Museums Victoria / CC BY
Author:
Notes: Shield with Garter (1813).
source

Coin - 1 Guinea, George III, Great Britain, 1813
Copyright: Museums Victoria / CC BY
Author:
Notes: King George III (1813).
source
List of 1 coins of type: Guinea from United Kingdom
NameMintageReignEffigyLegend
Guinea 1813 unknown King George III Seventh Head (Military Portrait) GEORGIVS III DEI GRATIA
Guinea: Some useful external links
Royal Mint: Guinea coin Wikipedia: Guinea (coin)