These old gold pieces from France are valuable. Yours has some damage, so its value will be limited to the value of the gold it contains. If it were in good shape, your coin would probably be worth $100 US dollars more than the gold content alone.
Here's how to calculate the value of the gold content. First, look up the value per Troy ounce on a web site such as
kitco.com. Then multiply that value by the amount of gold in your coin. In the case of a Louis Philippe 20 franc coin, that is 0.1867 Troy ounces.
For instance, at the moment gold is running $1105 US dollars per Troy ounce. Tomorrow it will be different, so be sure to look it up. The base value of your coin is then 0.1867 x 1105 = $206. A worn or damaged coin will be worth that much. A coin in excellent condition will be worth $100 more (or even more), which, in our example is $306.
Be sure to check for better dates and mint marks in the series. If you have one of these, the values go way up:
1831T: $2000
1832A: $1400
1832T: $3500
1835L: $3500
1846W: $2000
