Coin Forgery - Coin Community Forum

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Author	Replies: 9 / Views: 1,048
longnine009 Pillar of the Community United States 1247 Posts	Posted 09/22/2007 6:08 pm This is so cool! http://www.wipo.int/pctdb/en/wo.jsp?wo=1999044176 Report this Post to the Staff

acidic1 Pillar of the Community United States 632 Posts	Posted 09/22/2007 7:37 pm I got lost somewhere in the middle of all that. I think I'll stick to lookin' at'em. Report this Post to the Staff
Hollywood Pillar of the Community United States 1228 Posts	Posted 09/22/2007 7:39 pm NICE COIN Report this Post to the Staff
jcook54 Pillar of the Community United States 533 Posts	Posted 09/22/2007 7:40 pm I'll take your word for it. It look pretty neat but I got lost somewhere around the "exciting coil." Report this Post to the Staff
halfabustisbetter Pillar of the Community United States 1984 Posts	Posted 09/23/2007 12:46 am That would be very useful if all coins were struck from the same pair of dies at exactly the same pressure on indentical planchets. Report this Post to the Staff
Amazon99 Pillar of the Community United States 2443 Posts	Posted 09/23/2007 03:06 am What kind of coins are they affair are going to be forged if they're making this elaborate device? Seems to me that it's not worth the time and trouble. Report this Post to the Staff
Conder101 Bedrock of the Community United States 17884 Posts	Posted 09/24/2007 4:01 pm What they are basicly describing is a coil that sets up a magnetic field and then as the coinrolls through it they are looking at how it distorts the field. In other words the electromagnetic signature. (Same principle that a metal detector uses to discriminate between different coins and metal compositions. Every differnet alloy and size coin will distort the field differently. If you have it very finely adjusted it might be able to detect the difference between two coins of the same size and material that have very different designs. (Although I would suspect it would be so touchy that you would get a LOT of false alarms.) But sightly difference in design? No way. This isn't so much to detect forgeries as it is to spot the use of Korean coins in Japanese vending machines, which they had a big problems with awhile back. (After all, the coin will probably be rolling when it passes this detector so what it will actually be detecting is an AVERAGE of the surface contour. A coin with a totally different design would probably have a different average, but not just a forgery of the regular coin. The differences would be so slight in that case as to be undetectable.) So this thing will detect slugs, and if you are very lucky two different countries coins of the same size weight and composition, but that technology has been in use in vending machines for ages. I'm not impressed. Report this Post to the Staff
longnine009 Pillar of the Community United States 1247 Posts	Posted 09/25/2007 08:53 am Seems like a cast coin, no matter how deceptive it may be, cannot be compressed as tightly as a genuine coin struck under tons of pressure. This device would not be able to detect that difference on the surfaces? Report this Post to the Staff
just carl Bedrock of the Community United States 20753 Posts	Posted 09/25/2007 11:04 am That would be very useful if all coins were struck from the same pair of dies at exactly the same pressure on indentical planchets. Exactly. Just another silly thing someone came up with that is impractical. Report this Post to the Staff
longnine009 Pillar of the Community United States 1247 Posts	Posted 09/25/2007 8:17 pm I wasn't referring to same coins from same dies. I'm talking about the comparison of any genuine struck coin, say a Walking half for example. It was struck under 60 or 70 or whatever tons of pressure. Compared to a deceptive cast. How could the structure of the metal in that cast-- formally molten metal--be as tight as the metal from the struck version? There has to be difference in the surfaces just from the difference of precesses used to make them. Unless these differences aren't significant enough to register on such a device? Report this Post to the Staff
	Replies: 9 / Views: 1,048

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