1768 King George III Guinea
A beautiful example...
Third portrait laurel head with crowned shield reverse.
George III lived for 81 years and reigned for 59 years which gave him the legacy that made him known as the longest reigning monach at that time.
The design of the gold guinea was transformed from the crowned cruciform shields to the 'spade' shaped crowned shield of arms.
The crowned cruciform shield is generally harder to obtain in EF condition.