There's no silver in the 1965 dime. It's mostly copper with a bit of nickel, and weighs 2.268 grams.
Each 100 Pesos coin contains .6429 oz. of actual Silver weight. They currently sell for around $13 in almost uncirculated condition.
"ASW" means "Actual Silver Weight", and refers to the weight of the silver (in troy ounces) in the coin. To get the "melt value" of a silver coin (that is, the value of the silver in the coin melted down, without regard to any numistmatic value the coin might have), you would multiply the ASW by the current value of a troy ounce of silver ($19.92 as of March 2, 2008). By the way, the concept of "AGW" and "APW" (for "Actual Gold Weight" and "Actual Platinum Weight", respectively) is exactly the same.
Kennedy half dollars minted 1965-70 are 40% silver by content and weigh 11.5 grams. That makes 4.6 grams of silver per coin. One troy ounce contains 31.1 grams, so there are 0.148 ounces of silver per coin.
Each coin has a actual silver weight of .7523 ounces of pure silver and measures 38 mm in diameter.
Yes, like all half dollars minted before 1965, the Booker T Washington half dollar is 90% silver.
A silver pattern crown coin is a British coin that was produced between 1707 and 1965. This coin is made of silver and has a profile picture of Queen Victoria on it.
The only coins issued for circulation after 1964 to contain any silver were kennedy half dollars (1965-1970). They are 40% silver not 90% with an Actual Silver Weght (ASW) of .1479oz of pure silver. No other U.S. coins made for general circulation from 1965 to date have any silver in them.
All U.S. silver dollars from 1840 to 1935 contain the same amount of silver. They are 90% silver and 10% copper with an Actual Silver Weight (ASW) of .77344oz of pure silver.
If the coin is so worn that you cannot read it, it is a junk coin. It is only worth the silver weight, if it is silver.
The silver content of any coin with .500 fine silver is 50%. The silver will be alloyed with other metals, possibly copper and nickel, and maybe a few other metals. The actual weight of the silver used would depend on what other metals were used and in what ratios.
US dimes from 1965 to date are copper-nickel not silver. The coin is face value.
The 1956 South African 2 1/2 Shilling coin weighs 14.1400 grams and is 50% silver, giving it and ASW (Actual Silver Weight) of 0.2273 troy ounces.