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 Replies: 83 / Views: 10,258 |
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Rest in Peace
United States
9104 Posts |
Chinese coins being sold on ebay are usually victims of fuzzy pix, rare dates, and remarkably cheap, typically with Asian sellers. |
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Pillar of the Community
United States
648 Posts |
 EbaY picture forinsics (sic)   with biggfredd. Experts who know the fuzzy logic. In hand . Magnify, Magnet, Acid, S.G., X.R.F., T.F.D.  all you can do with photos, If you are good! Quote:
Fuzzy logic is a form of many-valued logic; it deals with reasoning that is approximate rather than fixed and exact. In contrast with traditional logic theory, where binary sets have two-valued logic: true or false, fuzzy logic variables may have a truth value that ranges in degree between 0 and 1. Fuzzy logic has been extended to handle the concept of partial truth, where the truth value may range between completely true and completely false.[1] Furthermore, when linguistic variables are used, these degrees may be managed by specific functions edit for Fuzzy logic (disambiguation).  Edited by tokenmast
01/31/2012 4:32 pm
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Valued Member
 Spain
134 Posts |
Yes, I always avoid the fuzzy logic on ebay... ... and China. So, these modern Chinese fakes are easily to spot then; when you have them in front of you. I mean, you could tell without doubts with the usual tests. About the acid... isn't it a bit risky to use it? I mean, if the coin turns to be authentic it will be burnt. Edited by silvermaniac
02/04/2012 3:18 pm
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Rest in Peace
United States
9104 Posts |
Quote:
So, these modern Chinese fakes are easily to spot then; when you have them in front of you. I mean, you could tell without doubts with the usual tests. Not always. There are fakes that fool the experts, but they're not gonna waste that skill on common coins. |
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Valued Member
Spain
134 Posts |
Do you think they would do it with common large silver coin (i.e. common dates silver crowns, mexican 100 pesos, Morgan dollars)? I don't know how much it would cost them to make a good fake; but they would be getting almost $50 each. |
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Rest in Peace
United States
9104 Posts |
They're not likely to make high quality fakes of those.
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Valued Member
Spain
134 Posts |
But they do it with silver bullion; don't they? I heard they're making quite good Chinese Pandas; that seem authentic until you apply acid at some depth... well I saw it on a YouTube video; but you know, you also see people doing quite some dumb things: like cutting in half a real gold philharmonic because they thought it was fake, or cutting in half a genuine kilo silver bar because it gave no ring tone.  Edited by silvermaniac
02/04/2012 10:18 pm
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Valued Member
Spain
134 Posts |
Just received my first fake coin, and I paid £13 for it.  This time, I have not doubt... it's actually a really bad fake; though I think it's silver. |
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Rest in Peace
United States
9104 Posts |
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Rest in Peace
United States
9104 Posts |
Quote:
About the acid... isn't it a bit risky to use it? I mean, if the coin turns to be authentic it will be burnt. Not risky per se, but I'd like to smack the idiot who tested a clearly marked and serial #ed .999 silver proof oz with COA. |
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Valued Member
Spain
134 Posts |
Quote:Now, this is a Russian silver 20 Kopeks from 1914. I got various of these coins (also of 10 and 15) and most are off weight -off by 5% to 10% less than they should-. They also show this strange field, which I never saw in any other coins but these Russian ones.  I asked other people, and without even seeing the coins, they told me that there are a lot of Russian fake silver coins around. What do you think? I'm still having a lot of doubts about these Russian Silver Kopek coins. First, they are sold quite cheap on ebay -they were about BV last year, but now they went up a bit- when its catalog price is considerably higher; second, most are in quite high grades (EF, AU, UNC); third, most come from Eastern European sellers with few points that mostly sell only this type of coins; fourth, the weight is usually off by more than 1%, though it is true that the weight of these coins is quite low -from 0.90g to 3.60g-; and fifth, the field just doesn't look right to me. Anyway, I was nearly convinced they were all fine, but just today I bought another lot, and look what came in... I mean, do you think this can be a genuine design or minting error on this 1862 20 Kopeks?   Edited by silvermaniac
04/03/2012 7:42 pm
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Rest in Peace
United States
9104 Posts |
You point out an obvious problem, which "could" be the way it was designed, but gubmint mints seldom allow such sloppy work. Now look at these three images:    The first is around 10 o'clock, the second is the same area, inverted to compare to the opposite side of the coin. It might be the lighting, but they don't even look similar to me. |
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Rest in Peace
United States
9104 Posts |
Around 10, they change from UUUUUU to VVVVVV.
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Valued Member
Spain
134 Posts |
Thanks Fred; just checked that out... it seems like it was the light; they are Us all around the coin.
I did further tests on all coins:
- Silver content seems to be fine.
- Diameter and thickness, also fine.
- Weight... well, apart from some of them underweight -probably due to wear-, and 1 that is 4% overweight, nothing else special.
- Checked out the design in photoshop against another coin of the same type from a numismatic catalog... an exact match... without the mistake on the top right corner, of course.
- Even checked the ring tone... all the same -for all the coins from different sellers-.
I just don't know... I think I'll never be convinced either way; nor will I buy any more of these coins, no matter how cheap they go.
Edited by silvermaniac
04/07/2012 8:58 pm
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Valued Member
Spain
134 Posts |
A question, and thought...
Do you think there are fakes that are so good that it would be practically impossible to detect it?
If so... would it matter? I mean, if it can't be detected, would it matter if it's a fake or not?
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Replies: 83 / Views: 10,258 |
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Posted 01/31/2012 3:35 pm
