FORVM`s Classical Numismatics Discussion Board
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great post!
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Thanks to Dr Prokopov for providing this valuable detection tool.
Unfortunately for me, after reading the article, I examined some coins in my personal collection and have found what I believe is this type of forgery.
>:(
Maybe I'm over reacting and the lines above the E on this coin are just flow lines? But they look very suspicious to me after looking at the pictures in Dr Prokopov's article....
Do the members of this good Forvm agree, that this coin must be moved to the dreaded black cabinet ???
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Dear Jerome!
Comparing your pic with the pics of Dr.Prokopov I see an important difference. On Dr.Prokopov's coins the traces are always on the slope of the letters whereas on your coins these lines are on the flan itself. I think this is an important difference!
Best regards
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Jerome,
can you please upload photo of the other side of this coin?
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Certainly,
Here is the obverse:
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This is good stuff, and useful ammunition for condemning other coins produced in this manner that may turn up in the future, but it is worthwhile pointing out that the overall style of the tremisses under discussion is so bad that no one who has any familiarity with these coins would ever be taken in by them. They look like junk.
Richard
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Jerome,
I cannot be sure without seeing the coin itself (and especially the edge), but I think this is a trace of hand work. I will keep this coin in my mind.
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The fields on Jerome's coin look authentic, while those on the fakes have a totally flat, 'dead' look. An engraver could easily leave marks like those.
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Dr.Prokopov - I hope you don't mind me using one of your pictures to ask a couple of questions.
1. Your discussion in the article is about tool marks that I have highlighted with red squares. Is this correct?
2. What causes the areas marked with blue squares?
Thanks
Rick
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Rick,
The core was not produced by the original method. This can be seen especially on the coin edge - there are sharp roughnesses and caverns.
Also, the coin is of nonquality gold (different from the ancient).
When making the core, there were many lapses, because of the production method. The original coins were made by a single hammer strike when heated. However this coin was made by slow pressing on the cold core. This resulted in such caverns.
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Dr. Prokopov are the red squares above, tool marks from the counterfeit dies? Is this something that is common to counterfeit dies?
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And...erm...what happened to Cliff's post??
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Apparently Cliff thought better of his post. This has been educational just the same, and I am glad of Dr Prokopov's involvement here.
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Rick,
The core was not produced by the original method. This can be seen especially on the coin edge - there are sharp roughnesses and caverns.
Also, the coin is of nonquality gold (different from the ancient).
When making the core, there were many lapses, because of the production method. The original coins were made by a single hammer strike when heated. However this coin was made by slow pressing on the cold core. This resulted in such caverns.
Mr Prokopov,
can you explain difference (and maybe show some photos) between caverns on fake gold coins made by pressing and caverns on genuine gold solidii occured because of impurity of gold.
Thank you in advance.
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And...erm...what happened to Cliff's post??
Looks like he stormed off, deleted his post here and posts in other threads too. Same kind of behavior in CFDL except there he deletes others' posts. I also agree that this new forgery detection techniquie is an interesting one, and thanks to Dr. Prokopov for pointing it out. It seems to me that there are two key diagnostics: 1) deep uniform cuts at the boundaries between fields and devices and legends and 2) tiny nicks at the boundaries between fields and devices and legends where the forger clumsily tried to soften or flatten the boundary.
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Looking at Jerome's coin, I think the marks above the E and Y are "flow" marks. These are caused when the movement of metal across the surface of a die, repeated many times during striking, gouges small channels into the die's surface. Subsequent strikings show these raised lines in the field. This is a common phenomenon on Roman denarii and antoniniani.
There is also a hint of very shallow parallel lines running diagonally downwards from right to left across the field. This looks to me like the result of some enthusiastic cleaning.
Bill Welch
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Dear all,
Dr.Prokopov asked me to appologize on his name for being silent these days. He is off to a small vacation and will be back in the end of this week.
Best regards!
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Rick,
The core was not produced by the original method. This can be seen especially on the coin edge - there are sharp roughnesses and caverns.
Also, the coin is of nonquality gold (different from the ancient).
When making the core, there were many lapses, because of the production method. The original coins were made by a single hammer strike when heated. However this coin was made by slow pressing on the cold core. This resulted in such caverns.
Mr Prokopov,
can you explain difference (and maybe show some photos) between caverns on fake gold coins made by pressing and caverns on genuine gold solidii occured because of impurity of gold.
Thank you in advance.
bump
Fake Coins and Notorious Fake Sellers => Topic started by: gibfrog on July 15, 2007, 12:51:52 am