Any collector value would depend on the year and condition of the coin.
At the very least, it will be worth whatever the current price of gold might be.
A mint condition Sovereign contains 7.322381 grams of gold.
Currently gold is at about $1,790 USD per ounce. That makes the gold content of a Sovereign coin worth about $79 USD.
a gold coin
it depends what the year is and what the grade of the coin is.
500 dollars
The gold coin you are talking about is a "Centenario" and it is worth about $1,200 dollars (or 785 Euros).
No. The British gold Guinea coin was a coin with a value of 21 Shillings and was 24mm in diameter. The Guinea was last issued in 1813 and was effectively replaced by the Sovereign. The British 22 carat gold Sovereign coin is a coin with a face value of One Pound (or 20 Shillings) and is 22.05mm in diameter. The modern Sovereign was first issued in 1817.
A 1848 five dollar coin is worth about 1,600 dollars to about 2,100 dollars. A 1848 five dollar coin has been auctioned for over 71,000 dollars.
A gold sovereign
eagle
About $2.00
Your coin is either a Sovereign (22.05mm) or a Half-Sovereign (19.3mm). All Sovereigns and Half-Sovereign coins are made from 22 carat gold.
The value of any coin would depend on the year and condition of the coin. At the very least, a 22 carat gold sovereign would be worth its weight in the current bullion value of gold.
If you mean one of the Sacagawea dollars or a Presidential dollar the date is on the edge of the coin and its not gold.