You need to be more specific. In 1974, Queen Elizabeth was the monarch for quite a few countries. Please post a new question including the denomination, country of origin and an estimate of the condition. When all of these elements are present, we can tell you a value, but otherwise we can't tell you if you have a coin worth several hundred dollars or less than a penny.
Queen Elizabeth II Bridge was created in 1991.
The Queen Elizabeth Bridge was built by one architect called Helmut Homberg. The Queen Elizabeth bridge was opened in 1991 by Queen Elizabeth the second.
Average current market value for the 1991 PF Koren War Memorial silver dollar is $17.00-$23.00 depending on the actual grade of the coin.
This stuff has no numismatic value at all, but check eBay for values
Freddie Mercury , lead singer of Queen ,passed away November 24th 1991, before his time suffering from pneumonia , an HIV/ AIDS complication. (catergory) Queen Elizibeth II however is alive and well.
50 cents, it is not silver and was a coin intended for circulation.
A New Zealand 1991 cupro-nickel Five Dollar coin (Elizabeth II)(Rugby World Cup), uncirculated and in absolute mint condition could fetch up to $15 NZD. There were 120,000 minted. A New Zealand 1991 sterling silver Five Dollar coin (Elizabeth II)(Rugby World Cup)(Proof), uncirculated and in absolute mint condition could fetch up to $40 NZD. There were 15,000 minted. A reputable coin dealer will be able to give a more accurate valuation.
The last Australian One Dollar note was issued in 1982 and they were progressively withdrawn from circulation after the introduction of the One Dollar coin in 1984.
Assuming that you refer to British coins, the 1991 5, 10 and 50 Pence coins are no longer in circulation and have little or no value. The 1, 2 and 20 Pence coins and the One Pound coins are still in circulation and are worth those amounts respectively.
Less than 1 dollar.
If you found it in change, 10 cents. An uncirculated one can retail for up to a dollar or so.
The U.S. didn't print any $20 bills dated 1991. Please check again and post a new question.