The Royal Mint released around 210,000 copies of the coin which makes it one of the rarest coin available.
The coin has knocked the "highly collectable" 2009 Kew Gardens 50p off the top spot for the first time in 15 years, the official maker of British coins said.
One side of the coin shows a the portrait of Queen Elizabeth II, while the reverse showcases the Chinese Pagoda at the Royal Botanic Gardens, surrounded by two intertwining stems.
Today, the title of rarest coin is believed to belong to a 50p featuring the Atlantic Salmon and bearing the King's portrait.
Photo credit should read: Royal Mint/PA Wire NOTE TO EDITORS: This handout photo may only be used in for editorial reporting purposes for the contemporaneous illustration of events, things or the people in the image or facts mentioned in the caption.
