I do not see the tiny spot of green as presenting any long term threat.
I have ancient bronze coins with a lot more green in area, but only presents as a very thin green layer, and have remained stable for over 30 years, with zero change.
Coin pictured has an attractive patina, that should not be disturbed.
Just keep this coin away from moisture or humidity, silica gel would help.
I have ancient bronze coins with a lot more green in area, but only presents as a very thin green layer, and have remained stable for over 30 years, with zero change.
Coin pictured has an attractive patina, that should not be disturbed.
Just keep this coin away from moisture or humidity, silica gel would help.























