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How much an 1883 Confoederatio Helvetica Rappen is worth depends on its condition. The typical value of such a coin is 12 US dollars.
"Confoederatio Helvetica" is the Latin name for Switzerland. Your coin is not unusual and has an exchange value of about $1.10 as of 09/2012
The value of this Swiss coin depends on its circulation condition. It can range in value from 5 dollars to 30 dollars.
4 dollars
10~20$
You have a coin from Switzerland (The Helvetian Confederation, to the Swiss). Anything that new is almost certainly only worth face value. You didn't state the coin's denomination - an important piece of information - but exchange rates in early 2010 have been in the range of CHF 1 = US$ 0.90
less than a dollar
One of these sold in an internet auction for $12.
It is likely worth a good deal, but that depends on the condition of the coin, and whether or not its authenticity can be proven.
You didn't indicate the coin's date, but assuming it's a recent coin you Swiss 5-franc piece only worth its exchange value of about $4.30 U.S.
78,000The value
This is a coin from Switzerland. Is it 10 rappen or 10 franc? This is an important difference. As with all coins, the condition is very important. A flawless coin will be the most valuable, and any signs of wear on the coin will lower the value.