15 gold coins
25 cents. Gold plating adds no value to the coin but rather can destroy the coins value. In this case it didn't because these coins are not rare and are worth only 25 cents.
2 cents coins from ecuador value
It will have no added value, unless it is a GEM uncirculated coin (worth about 25 cents), or a proof coin (worth about 50 cents).
The coin is still only face value.
If it was found in change, the coin is face value. A uncirculated coin is about 25 cents.
Three cents.
The face value of a nickel coin in the United States is five cents.
A common coin average value 3 cents, an up to a dollar in uncirculated.
The value of a 1923 Canadian 5 cents coin is (if in good condition) $0.20.
ten cents
5 cents. Not an unusual coin.
50 cents