Value would depend on the denomination of the coin, it's condition and what country it is from. Any coin over 400 years old would have some value to it. Take it to a reputable coin dealer for identification and valuation.
Pictures of a specific coin are difficult to come by. Often you should be able to find one on eBay, but the picture is withdrawn after the coin is sold.
The coin is worth 25 cents.
No, it's a novelty coin, manufactured specifically for people who want to know what the results will be when they flip a coin.
Most likely. They should be evaluated by a professional coin collector and him/her can give you a more detailed evaluation.
After the abolition of the Guilder, the new most valuable coin would be the 2 Euro coin
Put a picture of the coin!
I have a coin with "II MARIE GROS:" dated 1694. Talk to me!
Yes, of course they are valuable. Check out ebay.
I'm a coin collector, and I am not aware of the existence of such a coin, but if you could find one, I'm sure it would be quite valuable.
Ram darbar coin
A US dollar coin dated 1797 is a Draped Bust dollar. If you actually have a dollar coin dated 1797, take it to a coin dealer for an accurate assessment. The coin is rare.
Usually. A coin in Proof condition is almost always more valuable than the same coin in Uncirculated condition, but exceptions do exist.