The Isle of Man has its own circulating coinage, which is used in parallel with the British Pound Sterling; it also issues an extensive range of commemorative coins for collectors, as well as bullion coins in a variety of formats and designs for investors in precious metals.
These coins are usually in internationally popular standard formats, but some (such as this coin) are in non-standard sizes. They are considered Non-Circulating Legal Tender (NCLT) because they are "premium" editions released at prices much higher than their bullion value.
In 2009, the Pobjoy Mint issued this bi-metallic Angel, to mark the 25th anniversary of its extensive range depicting Saint Michael slaying the dragon. The original Angel was a gold coin introduced in England by King Edward IV in 1465 as a new issue of the Noble. Based on a French coin, the Angelot or Ange, its name was derived from the representation of the Archangel St. Michael. The image of the Archangel Michael slaying the dragon was thought to bring good luck and health and was traditionally given to sufferers of the disease the "King’s evil" or scrofula, in a medieval ceremony intending to cure them with the "royal touch".
The coin has a central circle made of one ounce of gold, and an outer ring of silver.
It is usually said that modern Angels are legal tender but without a fixed face value, like the Krugerrand or Mexico’s Libertad which are legal tender to the value of their precious metal content. However, according to the various Currency Determinations by The Treasury of the Isle of Man authorising each issue, under section 6 of the Currency Act 1992, the "Angel" denomination is equal to 5 pounds in face value, with fractions or multiples divided or multiplied as required by the fraction or multiplier shown on the reverse of the coin - hence, the one ounce has a nominal face value of £5 (five pounds). | 
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