At the time of decimalisation in 1971, the United Kingdom Crown coin (equal to 5 shillings) was redenominated as a 25p coin and pieces struck prior to 1990 - all the way back to 1818 - continue to be legal tender for that amount. The old denomination had been a regular circulating coin in the 19th century, but in the 20th century it became more of a commemorative denomination.
The Royal Mint continued issuing commemorative coins in the same format - using the traditional coin dimensions, but in copper-nickel. These were initially also denominated as 25 pence but the "Crown" was changed in 1990 to a commemorative £5 (five pound) coin, having the same dimensions and weight but with a face value twenty times as great.
The denomination is used to mark special occasions, usually royal in theme, rather than for use in general circulation. Although not circulating, these coins are legal tender.
This £5 Crown-sized coin is part of a four-coin set of silver coins called "Portraits of Britain", which is the third in a series of sets issued over several years. The 2017 set features iconic buildings from around the United Kingdom; this coin shows Hampton Court Palace in London.
Hampton Court Palace is a royal palace in the borough of Richmond upon Thames, 19.3 kilometres south west and upstream of central London on the River Thames. Building of the palace began in 1515 for Cardinal Thomas Wolsey, a favourite of King Henry VIII. In 1529, as Wolsey fell from favour, the cardinal gave the palace to the king to check his disgrace. The palace went on to become one of Henry's most favoured residences; soon after acquiring the property, he arranged for it to be enlarged so that it might more easily accommodate his sizeable retinue of courtiers. Along with St James' Palace, it is one of only two surviving palaces out of the many the king owned. The palace is currently in the possession of Queen Elizabeth II and the Crown.
Designed by Royal Mint engravers Laura Clancy and Glyn Davies, each attraction is viewed as though through the eyes of a visitor, giving the coins the feel of an impressionist painting, enhanced by the trichromatic colour-printing.
The coins were issued in Proof FDC grade in sterling silver only. | 
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