The most "unique fact" is, a little more than 300,000 were struck at the Denver Mint and all were melted the next day.
There were no silver dollars issued by the US Mint in 1964.
The 1964 Kennedy half has .36169oz of pure silver in it.
All the 1964 peace dollars were melted. My guess is you have a 50 cent piece half dollar. Which has 90% silver content also all per 1964 coins were also 90% silver
For 90% silver coins (1964 & before) 10.2537 grams.
Sorry no US dollar coins dated 1964
US silver quarters were struck form 1796-1964.
About $6 for its silver content
Silver Weight : 0.3617 Troy Ounce
80% or 0.36169 ounce's.
You don't.
1964 was the only year JFK halves were made of 90% silver alloy. The composition was changed to 40% silver clad in 1965, and to copper-nickel clad in 1971. A 1964 Kennedy Half Dollar contains .3617 ounces of pure silver. Multiply this by the spot price of silver to get the bullion value of the coin. At the time of this writing, silver was $16 an ounce, making a 1964 Kennedy Half Dollar worth about $5.80
1964 was the last year for silver quarters.