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There was no 1831 Third-Farthing coins minted. The Third-Farthing coin was produced for use in Malta.
It's William Henry Harrison, not Jefferson, and it's worth one dollar.
In good condition circa £30-50.
There are over 40 different William III Halfcrown coins and variants. The lowest value is £50, the highest is £8,500 GBP, plus those that are regarded as unique or extremely rare.
The value of a silver coin is always changing because the value of silver is always changing. See the related link below for a silver coin value calculator. This does not give the actual value of the coin but it does give the value of the metal used to make the coin. This is know as the melt value.
the smallest value of a coin is a penny.
intrinsic value If a coin had value because of its metal content, you would refer to the "bullion value" or the "melt value" of the coin, as versus the "numismatic value" that a coin which was rare or in exceptional condition would have.
Metal value depends on the purity of the silver and the weight of the coin. Numismatic value depends on the condition of the coin.
The value of a 1799 coin depends on the coin's denomination such as dime or quarter. It also depends on what country the coin came from, where it was minted and the condition of the coin. Without that information, it is impossible to state a value.
Taft and Washington
The value depends on the coin, it's age and condition.
The coin is only face value.