Need Help with these 2 Parthian Coins

I got a loop today from a jeweler to examine it closer. There is evidence of double striking on the back there is a ghost image around the top of the head and nose. Can cast fakes emulate this and is there any kind of forgeries that can. By the way the shopkeeper who offered me $500 upped his offer to $1400 today

 

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you have a couple of these things can you tell me if it is possible for a forgery to have evidence of double striking. Mine has a light double strike on the back around the head and nose.