The item is listed on the online marketplace for more than 136,000 times its face value and features the royal coat of arms. With King Charles III on the back, the coin dates back to 2022. The description of the item reads: “This 50p coin features Prince Charles, the heir to the British throne, as King III. (Image: eBay)"While the reverse side features the Royal Coat of Arms. Similar rare 50p coins are listed on eBay for whopping profits, with some previously on for as much as £100,000.