The 2009 Gold Proof Britannia One Hundred Pounds coin is a distinguished release from The Royal Mint, celebrated for its unique design and limited mintage.
 
Obverse: Features the fourth crowned portrait of Queen Elizabeth II, designed by Ian Rank-Broadley. The inscription reads "ELIZABETH II D G REG FID DEF 100 POUNDS," signifying "Elizabeth II, by the Grace of God, Queen, Defender of the Faith."
 
Reverse: Depicts Britannia standing in a horse-drawn chariot, a dynamic portrayal created by Philip Nathan. This design was first introduced in 1997 and reissued for the 2009 edition. The inscription reads "ONE OUNCE FINE GOLD 2009 BRITANNIA."