Prestige proof sets include 90% silver versions of a dime, a half dollar, and the 5 state quarters issued that year. All carry an S mint mark, for San Francisco.
They made 5 different coins sets in 1992 1.1992 S Proof $8.00 2.1992 S Proof Prestige $58.00 3.1992 S Proof Silver $18.00 4.1992 S Proof Premier $20.00 5.1992 Mint P & D $8.00
All circulating halves dated 1971 and later are made of copper-nickel, not silver, and are only worth 50 cents unless you have a proof or uncirculated specimen; these can be worth around $2. Starting in 1992 some proof halves were struck in 90% silver and sold as special "prestige" coins.
For the 1992 Kennedy half, only some Proof coins ( "S" mintmark ) were struck in 90% silver, they were issued in the Silver Proof and Silver Premier sets.
4 types of United States Mint Proof Sets were made in 1992. The clad 1992-S Proof set has a current retail value of $8. The Prestige set that has the Olympic half & dollar in it is $40.00. The regular silver set is $29.00. The silver Premier set is $31.
If you are referring to the the modern (1992-2011) "Silver Proof" sets, yes the coins are 90% silver.
There is no silver in currently minted US dimes. Silver was replaced by copper-nickel starting with the 1965-dated coins.Special "Prestige" proof sets containing silver dimes, quarters, and halves have been made for collectors since 1992 but these coins aren't intended for circulation.
No silver US coins are still being held by banks. It would make no economic sense to do that.Many silver US coins have been minted but not for circulation. Among these are;Silver "eagle" coins minted since 1986. These are really bullion pieces and are intended for collectors and investors but not for spending"Prestige" proof dimes, quarters, and halves included in special proof sets minted since 1992. Prestige coins are struck in the original 90% alloy used till 1964 for circulating coins. Again, these are sold only to collectors1964-D Peace dollars. A trial run was made but the price of silver shot up and the coins were worth more than $1 each so they were melted instead.
These were sold as bullion coins and track the price of silver, about $17/oz at this point. Those sold in "government packaging" should be proof coins. A 1992 S proof eagle should retail in the neighborhood of $60.
1964 was the last year for 90% silver coins and 1970 was the last for 40% silver coins. Special Bicentennial (1776-1976) collectors coins were made in 40% silver. From 1992 to date proof collectors coins have been struck in 90% silver.
1964 coins are 90% silver and 10% copper. 1965-70 are 40% silver 1971 and later circulating halves are made of copper-nickel 1992 and later Prestige Proofs (sold only to collectors) are 90% silver.
90% silver quarters were issued from 1794 to 1964. In 1975 & 1976 collectors coins were struck in 40% silver. Starting in 1992 90% silver quarters are in silver Proof sets.
The only Kennedy half-dollars after 1971 to have any silver are in Bicentennial (40%) silver Proof and Unciculated sets sold from the Mint. In 1992 the Mint started making "Silver Proof" sets again with 90% silver coins.