Coins minted in the Year 1779

What happended in 1779?
Monarch is King George III. Prime Minister is Frederick North, Lord North (Tory).
It's the Industrial Revolution. The Spinning Mule is invented by Samuel Crompton. The Iron Bridge is erected across the River Severn in Shropshire. Boulton and Watt's Smethwick Engine moves into service, and it still works today. Captain James Cook dies on his third and last voyage.
The American Revolutionary War (1775–1783) continues as American fights the War of Independence against Britain. Many battles are fought throughout 1779.
Obv Rev Cat Coin
  Guineas 1779 Guinea - George III