US Coins were never made of pure silver, it's far too soft. Up till 1964 the silver was alloyed with 10% copper for hardness. Half dollars dated 1965-70 were made of 40% silver because the price of silver had increased. No circulating US coins since have contained any silver.
There's more information at the Related Question.
The 1967 Kennedy half dollar is a 40% silver coin, value is about $5.00. The coin is very common.
If you look on the back it's a HALF dollar, not a dollar. Value is about $2.00 for the silver content.
There are .1479 troy ounces of silver in a 1967 US Kennedy half dollar.
At today's rate (6 April 2012) your half is worth $4.68 for the value of the silver (40% silver) Collector's value will be based on the condition of the coin.
The values is only for the silver it has(40%) and it's about $2.00
The 1967 Kennedy half dollar is a 40% silver coin (1965-1969) but so many were made only a very high grade uncirculated example is worth more than the silver in the coin. The silver value today is about $4.00
Please turn the coin over and check the denomination. It's a HALF dollar.
A 1967 Kennedy half dollar is only 40% (.14792oz) silver. Current spot price of silver is $32.06 it's intrinsic value is $4.74. A buy offer should be about $3.00 for a single coin.
There is no silver in the Canadian half dollar dated after 1967. If you have older coins (lucky you), the content is as follows: 1870 - 1919 92.5% silver 7.5% copper 1920 - 1967 80% silver 20% copper
About $4.50 for the silver. The gold plating adds no value and collectors will view it as damaged. However, a 1967 half dollar is 40% silver and is a common date only worth silver scrap.
The 1967 Kennedy half dollar is a 40% silver coin (1965-1969) but so many were made only a very high grade uncirculated example is worth more than the silver in the coin. The silver value today is about $2.70
the value is usally a dollar