$34per oz
A Guide Book of United States Coins 2007 states "No [dollar] coins were made for circulation from 1981 to 1998." That doesn't mean proofs and sets weren't made then. So that is all I know. And I could also be wrong. :)
It depends greatly on the year, early silver dollar proof dollars can be worth several thousand dollars, modern silver dollar proofs of common dates might be worth $20 or so for silver scrap.
Half dollars dated 1964 and earlier are 90% silver and are worth about $11 in silver content. Keep in mind that proof, error, and key date coins may be worth much more than pure silver content. And from 1965-1970 the half dollar was 40% silver and is worth about $4.50 in silver content. Half dollars dated 1971 and later are not silver unless found in a US mint silver proof set. Note that any half dollar made during 1965-69 is only partially silver and is worth about $3. Halves dated 1971 and later contain NO silver and are only worth 50 cents.
Yes, the 1964 coin is 90% silver and is worth about $11 in scrap silver, while the 1965-1970 issues are 40% silver and worth about $4.50 in scrap silver. All half dollars intended for circulation from 1971 onwards are only worth 50 cents.
As of July 2009, nearly $153.68.
This coin 2010 is worth between .45-50.00
Johnson Matthey's population is 2,012.
Johnson Matthey was created in 1817.
It's just a ounce silver bar. Check the web site. A single bar is currently selling for $29.48.
Silver bars can be bought in different sizes. the Johnson Matthey silver bar weighs 1000 ounces. There are some that weigh only 10 ounces.
Johnson Matthey is a chemical company that offers several different chemicals and products to its customers all over the world. They offer medical device components, metal joining, colours and coatings, and many more.
$34per oz
Peter Matthey's birth name is Peter James Matthey.
There are various chemical (and other) ways to test the purity of silver... however, you wouldn't want to do this for bullion as it could diminish the value. Legitimate silver bullion will be marked ".999 Fine" and will have information such as the mint or maker. Stick with well known brands such as Englehard or Johnson-Matthey if possible.
Francis Matthey was born in 1942.
Post new question with the date of the coin.