This does not appear to be a coin issued by the US Mint. Please examine it and then submit a new question with more details concerning it.
There is only 1 silver coin, the 40% Kennedy half dollar which contains 4.6 grams of pure silver.
1894 Greek Coin AENTA 20? how much is it worth cheers harry
The only Australian decimal general circulation coin to contain any silver was the 1966 "round" 50 cent coin. It was made from 80% silver and 20% copper. The price of silver soared in 1966/67 and the silver content became much more valuable than the face value of 50 cents. The coins were soon withdrawn from circulation and replaced in 1969 with the more familiar 12 sided cupro-nickel 50 cent coin.
This coin is 40% silver. Too bad it is not from 64 or earlier, as those were 90% silver. It is worth a dollar or two.
The 1966 Philippines 25 Centavos is composed of copper, nickel and zinc, with no silver content.
It's a common coin, still in circulation, has no silver and is just face value.
The last U.S. silver dollars were made in 1935. Please determine what country and denomination coin you have and post a new question.
1964 was the last year for silver Roosevelt dimes. The "star" was added after the coin was struck at the Mint and is not a rare collectible coin, but it's still 10 cents.
do you know how much money a silver 1872 dollar coin is and a 1922 silver dollar coin
The short answer is 1966. Australias last "silver" predecimal coins contained 50% silver. The last of these coins were minted in 1963 and 1964 and were withdrawn soon after decimalisation in February 1966. The only Australian decimal general circulation to ever contain silver, was the 1966 (round) 50 cent coin which had an 80% silver content. Due to the soaring price of silver a short time later, and with the benefit of the wisdom of hindsight, this was a terrible blunder since the silver content of the coin was worth much more than 50 cents, and these coins were withdrawn very quickly.
80% Silver
If you mean 40 years from 1966, this coin is worth about $2.50 because it is 40% silver. If you mean 40 years from the present, please wait until I can find my crystal ball, LOL!