First off, Euros weren't minted until 2002, secondly the 10 cent Euro is in common circulation, isn't gold and is worth simply 10 Euro cents.
If the coin is a Lincoln cent dated 1964 it may look like gold or have been gold plated but the US Mint has never made a gold one cent coin.
New Zealand 20 cent coins have never been minted in gold.
No US Mint has ever struck a 25 cent gold coin.
The coin (assuming it is a US coin) is only worth 1 cent. Either the coin was chemically treated to make it look gold or it was gold plated. Either way, it is not worth any more than one cent.
No the US has never made a gold one cent coin.
The D after the 5 means dollars not cents, the US has never made a five cent gold coin. Take it to a coin dealer for an idea if value.
It likely just looks gold colored, the US Mint has never made a coin one cent coin.
There never was a gold half cent coin. Gold is too valuable for such small denominations. Even at the (comparatively) low price of gold back in 1852 a half-cent made of it would have been about the diameter of a pencil eraser.
$1 - $100 depending on the coin if it is a $100 coin it is worth $100 if it is a 50 cent coin.
No they did not, only from 1864 to 1873. But there is a $2.50 gold coin dated 1894.
No gold US one cent coins were ever made. Please look at the coin again and post new question.