A British 1987 Gold Proof set, consisting of Two Pound, Sovereign and Half-Sovereign coins, could fetch up to £600 GBP. There were 12,500 issued. It should be noted that the value of any "coin set" is dependant on it being in its original packaging and condition. A reputable coin dealer will be able to give a more accurate valuation.
If the coins are a gold Proof set, the set probably consists of a Two Pound coin, a Sovereign and a Half-Sovereign and commemorate the 1986 Commonwealth Games. If that is the case and they are still in Proof condition and in the original packaging, it could be worth up to £650 GBP. It should be noted that the value of any "coin set" is dependant on it being in its original packaging and condition. A reputable coin dealer will be able to give a more accurate valuation.
A British 1985 set of Proof coins (Welsh £1 to 1p) could fetch up to £16 GBP. A British 1985 set of Proof coins (Welsh £1 to 1p - packed in deluxe red leather case) could fetch up to £20 GBP. It should be noted that the value of any "coin set" is dependant on it being in its original packaging and condition. A reputable coin dealer will be able to give a more accurate valuation.
A British 1987 gold Britannia Proof 4 coin set (£100, £50, £25, £10) could fetch up to £1,500 GBP.
A British 1987 gold Britannia Proof 2 coins (£25, £10) could fetch up to £325 GBP.
A British 1987 gold Sovereign Proof 3 coin set (£2, Sovereign and Half-Sovereign) could fetch up to £900 GBP.
It should be noted that the value of any "coin set" is dependant on it being in its original packaging and condition.
A reputable coin dealer will be able to give a more accurate valuation.
A British 1986 Proof set (Commonwealth Games - £2 to 1p), in absolute mint condition could fetch up to £20 GBP. A British 1986 Proof set (Commonwealth Games - £2 to 1p - in deluxe red leather case), in absolute mint condition could fetch up to £23 GBP. A reputable coin dealer will be able to give a more accurate valuation.
A British 1989 22 carat gold coin set (Elizabeth II)(500th Anniversary of the Sovereign - 4 coins - Five Pound to Half-Sovereign), uncirculated and in absolute mint condition and the original packaging, could fetch up to £3,500 GBP.
The values quoted are the best possible for the best specimens in their grades, but may be significantly lower due to varying demand for the set and the prevailing economic climate. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the set.
You do not specify which proof set or how many coins are in the set.
Assuming you refer to the "Gold Sovereign" 3 coin set -
A British 1987 22 carat gold 3 coin Sovereign Proof set (Elizabeth II)(including Two Pound, Sovereign and Half-Sovereign), uncirculated and in absolute mint condition and the original packaging, could fetch up to £900 GBP.
The values quoted are the best possible for the best specimens in their grades, but may be significantly lower due to varying demand for the coin and the prevailing economic climate. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.
Such a coin does not exist. The last British Halfcrown coin minted for circulation was minted in 1967. The last British Halfcrown Proof coin was minted in 1970.
8-1-11>>> This coin was issued as Proof and Uncirculated, both types have the same value of $400.00.
Proof and uncirculated coins are valued the same at $15.00
If you are asking about the silver one dollar coin. This coin was issued as Proof and Uncirculated, both types have the same average retail value of $24.00.
There are no British general circulation decimal coins that could be considered to have any collector value unless they are "Mint Uncirculated", "Proof", or part of a "Mint" or "Proof" coin set.
The first gold Fifty Pound coin issued by the Royal Mint was in 1987.
Even with a Proof coin grade drives value. So from $3,000.00 to $20,000.00.
A British 2000 Executive Proof coin set (10 coins), in absolute mint condition and the original packaging, could fetch up to £60 GBP.A reputable coin dealer will be able to give a more accurate valuation.
The 5 coin proof set has a value of $6, the 10 coin set has a value of $15 and the 10 coin silver set has a value of $48.
These coins have only just been released into 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 5 Pence.
Such a coin does not exist. The British 50 New Pence coin was first issued in 1969. The larger pre-1998 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.
Average retail value for the Proof coin is about $40.00.