2015 GREAT BRITAIN GOLD 1 POUND COIN. The product is a 2015 British Royal Mint Britannia gold coin struck with a fineness of 0.9999 and weighing 1/20 ounce. It is certified by NGC with serial number 4272305–036, making it one of the first 100 coins struck. The coin is in proof condition and comes from Spain, showcasing the high quality and craftsmanship of British bullion coins. Perfect for collectors and investors looking to add a rare and valuable piece to their portfolio. NGC PF70 ULTRA CAMEO. 1 OF THE FIRST 100 PIECES STRUCK! Coin in the Picture is What is for Sale. Herbs Coins Shop has been in business for 50+ years in Port Charlotte, Florida. BE SURE TO CHECK OUT ALL THE OTHER.