A British 1930 50% silver Shilling (George V), uncirculated and in absolute mint condition could fetch up to £95 GBP. If it has been circulated but still in good condition, it might fetch anything from £5 to £40 GBP.
The values quoted are the best possible for the best specimens in their grades, but may be significantly lower due to varying demand for the coin and the prevailing economic climate. A reputable coin dealer will be able to give a more accurate valuation based on inspection of the coin.
Britain did not produce a "Dollar" coin.
The British do not have a Twenty Dollar coin.
Look at the coin again, no US one dollar coins were struck in 1930.
A "one dollar" coin has the value of one dollar!
In order to give an accurate estimate, the coin should be seen. I suggest you take it to a coin dealer and have it appraised.
A particularly nice one might sell for a dollar.
value of 1845 us five dollar coin
1926 ten dollar gold coin value
the worth value of the liberty dollar coin is worth 50cents.
There is no such thing as a British 20 dollar coin. If you have a 20 dollar coin it must come from some other country (or even British colony)
The value of a dollar coin would depend upon the date it was minted, the mint mark and the condition of the coin.
The coin is still in circulation and only a dollar.