This look fake to you?

I think such coins are already out there. It sometimes takes multiple people noticing certain things across certain coins to even suspect them. I don't think the marketplace is rampant with high quality fakes though.

I also think you're a bit too worried about fakes! It's good to become familiar with signs of fakery but if you just buy from trusted dealers, or if you become very familiar with a given type of coin, the odds of you buying a fake are not high. As has been said over and over... know the coin or know the dealer. There are far more authentic coins than false coins out there.

That said, I'm sure we're all very curious about the Germanicus you mentioned recently:

High grade coins of Germanicus are not often seen and can be very expensive. There are however many high grade modern fakes. Also, I'm not sure what you mean by implying that posting a photo will keep it "rare and impossible to make a copy of." I don't think anyone will make a believable forgery from your photos and of course posting a picture doesn't lessen rarity.

Is it like the coin below by any chance?

 

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Not to speed up oxidation, but to encourage the copper atoms in the silver alloy to migrate out and accumulate in the boundary-zones between silver crystals, or something like that.

Read up about crystallization, (plus the links TIF helpfully provided) and you will be better equipped to decipher what you're looking at.

http://www.forumancientcoins.com/numiswiki/view.asp?key=crystallization
http://www.forumancientcoins.com/moonmoth/crystal_coins.html

 

No .obverse is a portrait

 

https://coins.ha.com/itm/ancients/r...ybidspage-lotlinks-12202013&tab=MyBids-101116


I actually found the coin. does anyone know about this auction house?

I am guessing they let a fake one slip by

just a warning to you folks if you ever tried to buy something from this auction house- they apparently make mistakes sometimes