The 1997 Gold Proof Britannia One Hundred Pounds coin was issued by the Royal Mint as part of the Britannia series, which began in 1987. The 1997 edition is significant because it was the first time the chariot design was introduced.
 
Design Details:
 
Obverse:
Features the third portrait of Queen Elizabeth II, designed by Raphael Maklouf.
Inscription: "ELIZABETH II DEI GRATIA REGINA F D 100 POUNDS", which translates to "Elizabeth II, by the Grace of God, Queen, Defender of the Faith."
 
Reverse:
Depicts Britannia standing in a chariot, pulled by two horses along the seashore.
Britannia holds a trident and shield, symbolizing Britain's naval strength and heritage.
This chariot design was created by Philip Nathan and was exclusive to the 1997 issue, making it highly sought after.
Inscription: "ONE OUNCE FINE GOLD BRITANNIA 1997"