Earlier this year, the Royal Mint issued a limited run of the final Britannias to feature the late Queen Elizabeth II. The bullion coin has been issued yet again, this time with the debut of King Charles III's effigy. This is the first instance that the Britannia has featured two monarchs in the same year, further adding to its collectible appeal. Often considered a "sister coin" to the American Silver Eagle, the everpopular Britannia contains one troy ounce of investment grade .999 fine silver.