If a vending machine refuses to accept your 0.50chf, 1chf, 2chf or 5chf coin, don't smash the machine. Instead take a look the coin. Good chances are its made of silver.

If it is dated 1967 or earlier, then bingo, its real Ag. Not worth much, but worth collecting. Coin counting machines, which reject silver coins, are slowly weeding them out of circulation.

The exception is 1969 5chf coins, which can also be silver. For some reason after whacking out a shitload of copper-nickel "Fünflebers" in 1968 (common as dogturds), they went back to silver for one more year.

Just yesterday I was wondering why a parking meter would not accept my 0.50chf coin when it says it should. Looked at it and it was 1934.

More info: http://www.zumbo.ch/coins/list.html