Unfortunately, that green stuff has most probably eaten into the surface, to cause tiny spot of corrosion damage.
If you remove the green stuff, a small pit in the metal would be revealed.
Pity; it has some nice residual luster in the lettering.
A long soak in olive oil will almost certainly darken it somewhat, because olive oil is slightly acidic. However, such treatment
may? facilitate removal of the green stuff with a toothpick.
Treat with VerdiCare after that.
None of the above treatments will improve tha value, but
may? improve eye appeal, despite residual luster being lost.
Not a big deal for an ancient bronze coin, but a problem in this case.
Why?
Because almost all ancient coins need some sort of cleaning after recovery anyway.
I

with above grading opinions, but nowhere near enough potential value to justify TPGrading and shipping fees.
Edited by sel_69l
04/08/2020 9:28 pm