These George III Sterling Silver 1787 Sixpences were only struck for circulation for just one year, 1787. What is even more interesting is that they were struck for the Bank of England to give out to their favoured clients around Christmas. You have King George III in an armoured bust on the obverse and four crowns and four shields on the reverse. Today the Royal Mint is charging £95 in Fine.
The reverse in some ways is even more interesting than the obverse. As you have the arms of England, Ireland, Scotland, Hanover and France. The coins on offer are very high grade and becoming very difficult to find these days. They are available in Extremely Fine. Remember that this coin is now over 230 years old and in very high quality.