How could you know a struck fake made with a CNC die?

A casual counterfeiter won't have the skill or the equipment to use these "secrets".
A professional counterfeiter knows them better than we do.
When progress makes counterfeiting accessible to anyone, there will be no "secrets".

 

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Silver coins can be struck by bronze dies. Any tech that can make a convincing bronze die is sufficient.

 

I was about to say that there is a machine called spark laser which you mentioned. But I don't understand what you mean by 'scorched black and not good for forging coins'? I know for a fact they use spark as of now. because a counterfeiter from Lebanon told me there are circles in Lebanon currently use spark machine to make high precision identical die to genuine coins and use them to hand strike a coin on ancient flans. this leaves no method useful. the style is right , there is no casting evidence as it is hand struck, XRF fails as they use ancient flans. I cant think of any method to detect such things. I asked the guy how someone would know these are fake? You know what was his answer? Lol he said only the faker who made them know. and he even said these forgers take pride when they see their coins are getting high bids in auction houses they get immense pleasure of how good their art is loool its disappointing for us as collectors makes me quit this alltogether. Although, if you own a good fake that auction houses and no one is able to prove it's fake, then at least you won't lose money and can sell it later but you cant for sure call it genuine. You have to always wonder about it which reduce the pleasure of having something made in ancient times but from financial perspective you are ok as others also won't know it's fake.

 

I think the only and only way to know a coin is genuine is when it has original patina. even though some try to fake patina it is still clear in many cases if patina is fake to me. But a cleaned coin is very very dangerous to buy. this is my 2 cent advice you take it or leave it up to you but those high end collectors who love cleaned and shiny ancient coins are taking a huge risk to end up with lots of fakes in their collection. Here is an example of a fake patina. I can tell the patina is made by sand and glue. But for many this might look very genuine patina

 

If those forgers use 'ancient' flans, it would make it even easier to spot their fakes. Remember that the diameter and weight must be bang on, and even if they used flans of the type they are trying to fake, an overstrike would leave all sorts of evidence on the end result. I am not convinced that experienced collectors/sellers have much to worry about...

 

They use ancient flans with correct weight. There are many worn (almost blank) ancient flans found in those regions in Lebanon and Iran and Afghanistan. How would you know a hand strike coin with ancient flan and die cutter by laser using spark? Please let me know the details on the method you use for such case. Also there are many genuine coins which were over struck. being over struck can not be a proof for forgery. second, if the coin is blank (very worn) or if heated to a point that leaves no original designs, then you won't see any over strike on it.