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KurtSSenior Member
Posts: 875 Joined: 15 Feb 2008
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Posted: Thu Dec 11, 2008 7:47 pm |
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Here's a coin someone found while roll searching. Does it look legit to you? I understand it's not a terribly detailed photo, so if there isn't enough to see, let me know--thanks!
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eagamesExpert Member
Posts: 3013 Joined: 15 Nov 2005
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Posted: Thu Dec 11, 2008 8:18 pm |
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Looks OK to me.
I see 2 areas of Blakesley effect, one is normal but the other isn't exactly opposite to the clips.
My guess is Blakesley is not as predictable on big clips or multiple clips.
Maybe as it goes through the upset rollers when it hits the area with both clips aligned with rollers it stops getting upset instead of only showing Blakesley opposite of the clip as it would with a single small clip.
I'm not an error expert, that's my thought.
See what others think.
_________________ Ed
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RhubarbSenior Member
Posts: 856 Joined: 24 Jan 2007 Location: West Georgia
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Posted: Thu Dec 11, 2008 8:39 pm |
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The Radius of the 2 clips seem to be the same. The 3rd to the SE is different.
I could use a press to make the same Radius. If one knows the Circumference of the Dies it could easily be determined.
_________________ There is no shame in not knowing; the shame lies in not finding
out.
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CoinboyJayMember
Posts: 99 Joined: 22 Nov 2008
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Posted: Thu Dec 11, 2008 9:37 pm |
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I knew that a genuine "clipped" coin had weakness opposite the clip but I had never heard the term Blakesley effect. So, I did what everyone does nowdays, I googled it!!
The SE clip looks like maybe a strait clip and there is some good info at the site http://www.triton.vg/StraightClip.html I found in my google search. I tells how to determine if a strait clip is genuine and weather it came from the end or the side of the metal strip the blanks are punched out of.
Very interesting AND I learned something tonight!! Thanks for posting that coin pic.
Give that link a quick read.
JAY
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eagamesExpert Member
Posts: 3013 Joined: 15 Nov 2005
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Posted: Thu Dec 11, 2008 9:58 pm |
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This one has a good desc of the Blakesley effect:
http://koinpro.tripod.com/Articles/CurvedClipDiagnostics.htm
It's the weak rim on the opposing side of the coin. They run blank planchets between rollers to "upset" the rim before striking the coins. If a planchet has a clip then as it goes between the rollers the missing section makes the rollers not press as hard in the area opposite of the clip creating the weakly upset rim on the opposite side of the coin. That merc on the link shows it best.
_________________ Ed
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DickExpert Member
Posts: 5780 Joined: 21 Sep 2006 Location: Rialto, CA.
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Posted: Thu Dec 11, 2008 10:07 pm |
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The two clips at 11, and 5, seem to off-set each other, and the other is quite cleasr. The rim at 12 oclock seems to have been "impacted, by the up-set mill, after moving by the clipped area.. Again at 11 oclock, the same, but lessor degree of impact is notable. Going on around, the Blakesly effect id noticed, and qwhen arriving to the six oclock position, a nearly normal rim is produced. Or is it my eyes?
I noticed on the link, the second edge shot also indicated which side the "cookie-cutter" was on, by the sort of 'hanging look on the edge. that is to say the 'cutter was on the lower side, (in the picture).
Dick
_________________ " Deja Moo: The feeling that you've heard this bull before".
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