If it is uncirculated and in mint condition, or a cased "Proof" coin, coin collectors or maybe a coin dealer will buy it.
The British 1977 cupro-nickel 25 Pence coin, formerly known as a Crown, is a commemorative issued for the Silver Jubilee of Queen Elizabeth II and is collectible.
1977
1977 Silver Jubilee (Queen Elizabeth)
There are no 1953 Jubilee coins. 1953 was the year of the Coronation of Queen Elizabeth II. Her Silver Jubilee was 1977, her Golden Jubilee was 2002.
1977 was Queen Elizabeth II's Silver Jubilee year, nothing to do with Charles and Diana. Diana would have only been 16.
The Royal Mint issued no 1977 commemorative gold coins.
Prince Charles, the Prince of Wales, has only appeared on two British coins to date. 1. The 1981 25 Pence (Crown) coin commemorating his marriage to Lady Diana Spencer. 2. The 1998 Five Pound (Crown) coin commemorating his 50th Birthday. The 1977 coin to which you possibly refer is the Silver Jubilee of Queen Elizabeth II commemorative 25 Pence (Crown) coin.
Such a coin does not exist. In the English Monarchy, a "bronze" Jubilee is not celebrated or commemorated. A bronze Jubilee represents an anniversary of 8 years which is not a significant milestone. 1977 was the Silver Jubilee year (25 years of reign) of Queen Elizabeth II. 1972 was the Silver Wedding Anniversary (25 years of marriage) of Queen Elizabeth II and Prince Phillip. Crown commemorative coins (25 Pence) were issued for both.
The only reference I can find to a British 1977 coin set, is for a set of 7 coins commemorating the Silver Jubilee of Queen Elizabeth II. A British 1977 set of Proof coins (Silver Jubilee Commemorative - Proof Crown plus 50p to halfpenny inclusive) could fetch up to £12 GBP. It should be noted that the value of any "coin set" is dependant on it being in its original packaging and condition. A reputable coin dealer will be able to give a more accurate valuation.
a grandmother
6 February 1977
1977.