That depends on the mint mark, purity, condition, rarity, age and size of the coin.
I really doubt if you have a 'coin' of that size, but 25 ounces of gold would be worth $20,000 - $24,000.
At the moment 1 Swedish Krona is worth about 0.13 dollars.
That depends on the size and age of the coin. A small, young coin wouldn't be worth more than $200, but an old, large coin would be worth about $200k. Yes, but .. It depends on its rarity as well. Some "large old" coins can be very common among collectors and sell for only a bit more than their metal content. You need to know several things - > What is the coin's date? > What is its denomination? > What country issued it? > How worn is it? > If it's from a country that uses mint marks, what is its mint mark? Without those facts it's simply not possible to give a blanket answer. If nothing else, though, they would be worth whatever gold is worth at the moment. It would take more information to determine whether they are worth more than that.
If it's a Canadian $1 coin that's the same size and similar in color to a US $1 coin (i.e. golden / brass color and a bit larger than a quarter) it's a common circulation coin worth only face value.
Mexico 5 Pesos 1955 Size 19mm Weight 4.1666gm Purity 0.900 Bullion value 126.99 GBP today's date.
An amount of copper that size is probably worth very little (not even enough to be exchanged for cash).
Sounds like you have a broadstrike error. This is a coin that was struck outside the retaining collar. Without the collar the coin spreads out and is larger than the normal size. Lincoln cents are generally worth about $5.00. Very wide and well centered pieces will bring more.
This piece may be a Bicentennial medal made by the American Coin Company. It would be about the size of a penny and struck in .500 gold (10k) with a weight of 2.4 grams. It is NOT a U.S. Mint product. Take it to a jeweler, it's probably worth a few dollars.
Uk gold coins come in various sizes and the value depends on the size.
If it's a modern $1 coin (1987 or later) and the same size as a US $1 coin, it's a common circulation piece worth only face value. It's made of brass-plated nickel, not gold.
A two cent US coin is larger in size than a ten cent US coin.