Mintage was around 1400 sets. (2000 were authorized) Most were melted when Platinum spiked in price. If you can find a set expect to pay $8500+ I've only seen one set on eBay over the last 5 years and it sold for $9200 back in 2008.
The Swiss franc hasn't been made of silver since 1967. The coin is worth face value, which currently converts to $2.26 in U.S. dollars.
"Helvetia" is the national name for the country we call Switzerland. You have a standard circulation coin worth face value. At current exchange rates 1 Swiss franc is worth about 83¢ U.S.
Chances are, you have a 1947 Swiss 20 Francs coin. These coins are common and worth scrap gold. They contain 0.1867 of a troy ounce of gold and are 90% pure. And worth about $300 in gold melt at the time of writing.
Your coin is from Switzerland and is still in circulation. At the exchange rate in effect early in 2010 it's worth a bit less than US$1.
2 Fr. u kunama
in circulated condition about 10 cents
anywhere between 250-350 usd
one US dollar is worth 1.02 Swiss francs
If a dollar is worth 3 Swiss francs today and 10 Swiss francs tomorrow, than the dollar is appreciating (that is, increasing in value - it is worth more Swiss francs than before) and the Swiss franc is depreciating (that is, reducing in value - it used to be worth 1/3 of a dollar, and now it is only worth 1/10 of a dollar).
Platinum is worth up to $500.00 to about $600.00 an oz.
A penny does not contain platinum.
The 1943 US pennies were steel, not platinum. Their worth depends on condition.