A collector might pay a dollar or two, but anything dated earlier than 1997 has since been demonetized in Britain.
The value of the copper in a 2 Pence coin would be significantly less then 10% of the face value of the coin at the time the coin was minted. Today, it might be a little more, about 0.2 Pence.
All years of issue of the British decimal Twopence coins are still potentially in circulation so, unless they are part of a Proof or Uncirculated mint set or are individual Proof or Uncirculated coins and in absolute mint condition, they are worth 2 Pence.
No. A crown in British coinage was worth 60 old pence, or 5 shillings, or 1/4 of a pound.
These coins are still potentially in circulation so, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they are worth Two Pence.
Around 500 dollars
3,000 dollars in the year 1980 is equally to 9,115 dollars and 34 cents in 2014. This is because inflation is a little over 3 percent.
The larger (28.5 mm) pre-1993 10 Pence coins were withdrawn from circulation and demonetised in 1993. So, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they have little or no value. A British 1980 cupro-nickel 10 New Pence coin (Elizabeth II), uncirculated and in absolute mint condition could fetch up to £0.75 GBP. A British 1980 cupro-nickel 10 New Pence coin (Elizabeth II)(Proof FDC), uncirculated and in absolute mint condition could fetch up to £1 GBP. A reputable coin dealer will be able to give a more accurate valuation.
One Pound GBP in 1980 had the purchasing power of about £2.87 GBP today.
Morgan dollars were minted from 1878 to 1904 and again in 1921. Susan B. Anthony dollars were minted in 1980 and they're made of copper-nickel, not silver and have no added value if found in change.
The larger pre-1997 50 Pence coins were withdrawn from circulation and demonetised in 1998. So, unless they are part of a Proof or uncirculated mint set or are individual Proof or uncirculated coins and in absolute mint condition, they have little or no value. A British 1982 cupro-nickel 50 Pence coin (heptagonal)(Elizabeth II), uncirculated and in absolute mint condition could fetch up to £2 GBP. A British 1982 cupro-nickel 50 Pence coin (heptagonal)(Elizabeth II)(Proof FDC), uncirculated and in absolute mint condition could fetch up to £2 GBP. A reputable coin dealer will be able to give a more accurate valuation.
Between 50-75 dollars.
Please check your coin again and post a new, separate question. A coin with the denomination "2 new pence" would be a British decimal 2-penny coin minted from 1971 to 1981. A coin with $5 would be from one of the many countries that use some variety of dollars as their currency but it could not be from Britain because the UK's currency is pounds sterling and not dollars.