Clacton Stater

Gold plated? So a counterfeit?

It looks that way. The coin is very underweight at 4.5 gm should be about 6 gm. It looks like a gold foil coating but instead of a bronze core it is an elctrum inner which i guess if it was a counterfeit would still fool someone if it was cut into to test it. Another theory is that it could have been an official issue just that they were very short of gold. I would guess a counterfiet mixed in with allot of true coins it would be hard to spot without weighing every one. I also think many were used as offerings as no silver coins come up on these sites and to keep losing single gold coins is very rare in any historic age.