Marc Antony

It's interesting,

this same seller has an VRBS ROMA listed that looks very genuine, but has unusually smooth surfaces, similar to the OP coin, yet the reverse still shows flow lines near the outer edges.

http://www.ebay.co.uk/itm/SUPERB-RO...em5d43e97272

Markbaer, nice one on vcoins:
https://www.vcoins.com/en/stores/ae...Default.aspx

Thanks pishpash! I just emailed them to ask about certification.
mark

markbaer, search vcoins for Marc Antony, there might be better ones to suit your pocket.

That's quite scary if 3d printers can be used to generate fakes, especially if you can scan authentic coins and replicate them...

"The Case of the Nearly Perfect Counterfeit Coin"

http://www.theatlantic.com/technolo...coin/259482/

Can 3D scanning reproduce the effects of the slow progression of silver crystallizationin in an ancient coin over a period of 2,000 years?

It is always possible for a very reasonable cost, to test the coin using X-ray florescence (XRF), looking for trace metals that would be found in the same proportions as for known genuine tetradrachms of the same period and mint.

I asked for some pictures of the edge of the coin. We now have them, and that is good.
For myself, an 'in hand' examination of the crack on the edge of the coin could be useful, using a 20X loupe. I would then compare with the cracks on other coins of the same mint and period.
Most specialist coin dealers of ancient coins worth their salt should be able to satisfy themselves, regarding the authenticity of the coin umder consideration.