There were no coins issued in 1977 to commemorate Churchill. The 1965 cupro-nickel five shillings issued in 1965 to commemorate his death are worth from 50p to £1. In 1977 Queen Elizabeth II commemorated her silver jubilee. 25p coins were issued in cupro-nickel (now worth 30p - 50p) and those made in silver have a scrap value of around £15.
The Royal Mint does not issue Commemorative copper coins. The only Queen Elizabeth II commemorative coin issued in 1953 was the cupro-nickel Coronation Crown.
Winston Spencer Churchill was knighted by Her Majesty Queen Elizabeth II on April 24th 1953 at Windsor Castle.
Ford
The 1965 Sir Winston Churchill coin issued by the United Kingdom features a composition of 50% silver and 50% copper. This coin was part of a series commemorating Churchill's life and contributions, and it carries his portrait on one side and the image of Queen Elizabeth II on the reverse. The use of silver in its composition gives it a distinct sheen and durability, characteristic of commemorative coins of that era.
You are probably referring to the 1965 commemorative Crown (a denomination equal to 5 shillings, or a quarter of a British pound) issued in Great Britain. The coin is larger and thicker than a US silver dollar, and there is a portrait of Queen Elizabeth the Second on the front, and a portrait of Winston Churchill on the back. It is worth about a dollar in circulated condition.
What you have is a copper-nickel commemorative crown (5 shillings in the pre-decimal system). Unfortunately, it is incredibly common and only worth about a dollar or two (about 50p-1 pound) if perfectly uncirculated, and not much if circulated.
The Prime Minister at the time was Winston Churchill and the Monarch was Queen Elizabeth II.
He was made a knight of the realm by Queen Elizabeth II in 1953
She didn't want to die
If it is uncirculated and in mint condition, or a cased "Proof" coin, coin collectors or maybe a coin dealer will buy it.
Queen Elizabeth II is not. Queen Elizabeth the Queen Mother was.
Sorry, meant a 1962 Gold Two Shilling coin - maybe commemorative 10 year?