What are the raised green spots on this Philip II Tetradrachm?

[Gabe]

13.12 gram 
25 mm

[rover1.3]

I dont know what these greens are,but this is published as a fake here

http://www.forgerynetwork.com/asset.aspx?id=2yeC4vZYhbI=
http://www.forgerynetwork.com/asset.aspx?mode=6Q/zOXMHeZ0=&id=0KoOLJnsiAI=
http://www.forgerynetwork.com/asset.aspx?mode=6Q/zOXMHeZ0=&id=~x~KWtT5ccyS4=
http://www.forgerynetwork.com/asset.aspx?mode=6Q/zOXMHeZ0=&id=ZjAJhLTky2s=

I guess there are plenty of these "twins" around.

[gallienus1]

The obvious answer is copper oxide, but this is usually only seen on a tetradrachm from a “debased” series that naturally contains a higher proportion of copper, such as seen in the Roman provincial coins from Alexandria or Syria. It is a bit of a worry when combined with the fact that the coin is about 1 gram too light for a normal example. 

Best Regards,
Steve 

[casata137ec]

Are you guys sure that it is not a fouree? There looks to be a break in the silver on the bridge of his nose. If it is a fouree then that would also explain the green globs.

Chris

EDIT: the 5oclock on the rev seems to have a chunck missing from the plating as well
C.

[rover1.3]

Are you guys sure that it is not a fouree? There looks to be a break in the silver on the bridge of his nose. If it is a fouree then that would also explain the green globs.

Chris

Chris
I gave some "twins" before,check them

[casata137ec]

I did. I am simply commenting on what I see on the coin pictured. I have a couple of thickly plated greek fourees that in the break areas they curl up like that with noticable edges. You are more likely correct though.

Chris