Great Britain - (4) Coin Official Britannia Gold Proof Set - Mint Issued Box - 1987 - As issued by the Royal Mint and listed in Krause's Standard Catalog of World Coins as PS52, includes coins KM-950, 951, 952 and 953. This set contains an actual combined gross weight of 1.6063 troy ounces of pure gold. Each of these four coins features Britannia standing with the traditional trident and shield. Total mintage for this beautiful set was less than 2,486 units.