Unless they're uncirculated, 25¢ each.
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Standing Liberty quarters are often found quite worn. So if your coin is close to mint state, it could be worth about $20-30. If your coin is worn, since 1930 isn't a key date for standing liberty quarters, it sells close to melt which is about $6.80 at the time of writing.
The value for off center stuck quarters will depend on several factors. It will depend on their condition and if there is a supply and demand for them. A coin dealer can give an appraisal on their worth and value.
The quarters, half-dollar and dime are struck in 90 percent silver, generally referred to as "coin silver."The silver proof quarters weigh 0.180845 oz - multiply that by the current silver price to get the value for that coin.
There's no such coin. The U.S. didn't exist until 1776, and the first quarters were minted in 1796.
You can find specialist collectors online who may be willing to sell or trade coins. Try a hobbyist's magazine or website specialising in coin collecting. Online auction sites such as eBay are also a good place to look.