You need to provide a denomination, all you've done is tell us you've got a Swiss coin. The value depends dramatically on the denomination, along with the condition.
Over 9000$$$$
Based on my references the 1952 Helvetia coin is valued at .21 cents. However, there is only a .001 USD value.
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.
anywhere between 250-350 usd
The 1943 coin is about $3 at most. The 1951 coin is about $1 at most.
The coin is only face value
2p
23 karat
As of today bullion value is $6.30 for this coin a uncirculated coin is about $10.00.
The more common name for the leathchoróin is the Ireland Half Crown. The 1951 edition of this coin is valued from $1 for a worn coin to $5 for a fully uncirculated coin.
"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.
A reputable coin dealer will be able to value your coin. If the coin has been circulated, you might be lucky to get 50 pence for it.
Please look at the coin again, it's a half dollar not a dollar and value is likely about $5.00 just for the silver.