In 1878 Queen Elizabeth I had been dead for over 2 centuries and Elizabeth II was a half-century in the future so you couldn't have a coin with either monarch.
Please post a new question with the coin's denomination and date. You do NOT have to include the words "Dei Gratia Regina ..." 'cause they're on ALL coins from the British commonwealth / empire.
It depends greatly on the year and the condition. An average circulation Queen Elizabeth II penny might only be worth 10 cents, while a rare date older penny may be worth several hundred dollars in perfect condition.
Such a coin does not exist. The British 1896 Penny showed what is known as the "old veiled" or "widow head" bust of Queen Victoria. What is known as the "Bun" Penny shows a younger Queen Victoria with her hair tied in a "bun" and was issued from 1860 to 1894.
About $1 for its silver content. Note that because Canada is a member of the British Commonwealth, ALL of its coins carry the Queen's picture and that motto, so it's not a way of identifying any Canadian coins.
Queen Elizabeth the 2 autograph worth a billion dollars. Actually, it depends.
1 penny
It's worth exactly 5 pence.
A variety of stamps have been issued during the reign of Queen Elizabeth II. The 4D Queen Elizabeth stamp is worth between .75 and 1.50 pounds.
As of 2014, the value of a Queen Victoria penny ranges from £1 for a coin in fine condition to more than £4,000 pounds for a rare issue in uncirculated condition.
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.
Please check your coin. The Halfpenny has been out of circulation for well over 20 years, and Queen Elizabeth II is not very likely to be with us in 2963. If you refer to a 1963 British Halfpenny, the coin has very little value if it has been in circulation.
These are still in circulation today and unless there is something very special about your particular coin then it is worth 2p (£0.02)
I am unsure of what the value of your 1955 Queen Elizabeth 0.50. I recommend taking it to a bank or coin collector to see if the coin is of any value and if so, how much it is worth.