The listing, 7-sided BRITISH / GREAT BRITAIN / U.K. COIN: 1997 - 50 PENCE has ended.
The coin is not circular but is an equilaterally curved heptagon. While the coin is of a shape which doesn't have a fixed radius about any point, it does have a fixed diameter as a minimum dimension across the face of the coin that allows the coin to be more easily used and verified as legal tender automatically in vending machines and slot machines for example and also to roll freely.
Reverse: Britannia and lion, 50 below, FIFTY PENCE above.
This is the actual coin you will receive.
All modern British coins carry a Latin inscription whose full form is ELIZABETH II DEI GRATIA REGINA FIDEI DEFENSOR, meaning "Elizabeth II, by the grace of God, Queen and Defender of the Faith". The inscription appears on the coins in any of several abbreviated forms, typically ELIZABETH II D G REG F D. This is a 50p coin dated1997. Some wear from circulation as shown in actual photo.