There's no guarantee for it, but the idea is that you can hope to find silver dimes, quarters, or half-dollars in bank rolls. Half-dollars are supposedly the preferred coin, because while silver dimes and quarters were discontinued after 1964, halves still had silver until 1970.
If you are talking about a US coin, you have to go to the US mint website to buy silver coins. Banks don't sell silver coins. They don't distribute them either.
it is illegal in Mexico to take coins to other countries
Coins struck for circulation in the US today have no silver in them.
1837 was the year US silver coins changed to .900 silver & .100 copper, that caused a slight reduction of silver.
No current circulating US coins contain any silver at all. For information about older coins, please see the Related Question.
The US Mint did not issue any silver coins of any kind in 1980. If you have silver coins dated 1980, they are not US coins.
US Coins go from the Mint to one of 12 Federal Reserve Banks and then to local banks were they are released into circulation.
The Balboa is the same as the US dollar. We know that US silver dollars is worth more as the Panama silver Palboa. In Panama the currency is US but there are Balboa dollar coins. Also, the silver coins in Panama are the same size as the US coins and would be worth more as the US silver coins.
It was 1964 when the last coins in the US were made from 90% silver.
Silver coins can be purchased from a number of places in the US. You can purchase silver coins directly from the United States Mint, and most cities contain many stores for buying and selling silver and gold coins.
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.
Are silver coins made by the US Mint. Quarters, Dimes, Half dollars and dollars struck for circulation dated 1964 and prior are 90% silver. Half dollars dated 1965-1970 are 40% silver. All US coins intended for circulation dated 1971 and later are not silver. The US has and does mint silver coins intended for collectors including the American Silver Eagle, since 1992 they have made a silver proof set and there have been many silver commemorative coins minted.