The ten franc coin was minted in Paris in 1856 and is made almost completely of pure gold (93%), the IAA said in a statement.
Napoleon III, a nephew of Bonaparte, was elected President of the French Republic in 1848, but in 1852 had himself declared emperor.
He was captured in September 1870 at the Battle of Sedan during the Franco-Prussian war, and deposed two days later. He died in exile in England in 1873.
According to IAA numismatist Robert Kool, the discovery of gold coins during archaeological excavations is extremely rare.
‘This is the first time that such a coin was found in an excavation in Jaffa,’ he said.