See the link below.
Dating back to about 1797, the predecimal British Penny had the iconic figure of Britannia, in one for or another, on the reverse. Since the introduction of the decimal British Penny until 2008, the reverse has had a crowned portcullis (gate) on the reverse. From 2008, all British coins had a new design for the reverse and when all of the "Pence" coins are suitably arranged, combined they show the "Royal Shield". The current Penny shows part of the shield indicating part of the England and Northern Ireland shields.
Various British coins dating back hundreds of years have had a shield of one type or another on the reverse. The only current British coin to have a full shield is the new design One Pound coin first issued in 2008.
I don't believe that any British coins have an Eagle on the reverse. The only coins that I know of that have eagles on the reverse are American coins.
Queen Elizabeth I, Queen Mary, Queen Anne, Queen Victoria and Queen Elizabeth II have been on the obverse of all British coins during their respective reigns. Britannia has been on the reverse of many different British coins for hundreds of years. Queen Elizabeth the Queen Mother and Princess Diana have been on the reverse of several British coins, and Queen Victoria appeared on the reverse of the 2001 Five Pound coin.
Queen Elizabeth I, Queen Mary, Queen Anne, Queen Victoria and Queen Elizabeth II have been on the obverse of all British coins during their respective reigns. Britannia has been on the reverse of many different British coins for hundreds of years. Queen Elizabeth the Queen Mother and Princess Diana have been on the reverse of several British coins, and Queen Victoria appeared on the reverse of the 2001 Five Pound coin.
If you refer to British coins, Queen Elizabeth II is the current head of state of England and appears on the front of all British coins.
There's information at the links below:
No, they are not rare. British coins were minted that way for hundreds of years. The process is called "Coin Rotation" or "Die Axis". British coins were minted with a 180 degree rotation, so that reverse is 180 degrees out of alignment with the obverse. The practice was gradually discontinued during the course of the 19th century. By 1887, all coins were minted without "coin rotation". Many other countries used "coin rotation" on their coins and not always at 180 degees.
All British Two Pound coins have a date on them somewhere. The coin to which you possibly refer is the 1995 50th Anniversary of the end of Second World War, with a dove on the reverse. The date (1995) is on the edge.
From 1937 to 1966 inclusive, British Shilling coins were minted with one of two different reverse designs. Shillings with what is known as the "English" reverse, shows the English Coat of Arms which depicts three lions (which are actually leopards). Shillings with what is known as the "Scottish" reverse, shows the Scottish Coat of Arms which depicts a lion rampant. Both Coats of Arms are "Crowned".
The 1826 British Shilling and Sixpence coins are both sterling silver and both have a lion standing on a crown on the reverse. The Shilling is 23.5 mm in diameter. The Sixpence is 19 mm in diameter.
The reverse designs of British One Pound coins are changed annually on a rotating basis since 1983 when they were first issued. Since 2008, the standard issue reverse design is that of the Royal Shield.