Net Weight Of Empty Slabs - Coin Community Forum

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Author	Replies: 6 / Views: 2,878
sel_69l Bedrock of the Community Australia 21786 Posts	Posted 09/19/2013 9:36 pm There has been a lot of discussion about suspect fake coins in suspect fake slabs, especially with suspect Chinese origin silver coins. Chinese origin fakes are usually at some variance from the weight of the equivalent genuine coin. What is needed is a small data base, covering the net weight of genuine empty slabs. This information can be researched in two ways: 1. Information direct from the manufacturer of genuine slabs 2. When CCF members break open a genuine slab, the total weight of the broken bits could be recorded and added to the data base. With genuine slabs, I would think that there have been a few different versions on them over the years, with different empty slab weights. That is the reason for a small data base. With this information, the total weight of a suspect slab and coin can be determined. The weight of the empty slab can be subtracted from the total weight, to determine the weight of the coin inside the slab. That way, the weight of the coin can be determined, without the need to break the slab. Report this Post to the Staff

JJHFL Valued Member United States 395 Posts	Posted 09/19/2013 10:25 pm What about just deducting the known weight of a coin we had slabbed ourselves from a slabbed coin? That should achieve an accurate result, correct? Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21786 Posts	Posted 09/19/2013 10:29 pm Absolutely correct! The information about the net weight of a genuine slab can then be known, and added to the data base. Report this Post to the Staff
gxseries Pillar of the Community Australia 3831 Posts	Posted 09/19/2013 11:58 pm Why can't the weight of the coin be put on the slab label and then another label to put the gross weight on the slab and coin itself? Sounds like a lot of work but when you talk about coins in terms of hundreds to thousands of dollars, I'm sure it will come to this stage sooner or later. My partial coin collection http://www.omnicoin.com/collection/gxseries My numismatics articles and collection: http://www.gxseries.com/numis/numis_index.htm Regularly updated at least once a month. Report this Post to the Staff
JJHFL Valued Member United States 395 Posts	Posted 09/20/2013 08:04 am I am thinking the most accurate way to determine (aside from asking the mfg directly for the specs, which I am guessing they may not be willing to share info) is the method I described above. If you measure pieces from a broken slab, even one that was cracked open with care, you are still likely to end up with missing pieces and bits no matter what you do. To get a true weight, you would have to weigh your raw coin (since there is a mint tolerance), send it in to get slabbed and the weigh on its return. You would then have the true weight of the slab and could produce a data chart. Then, the true weight coupled with the mint Weight Tolerance of any coin would produce a chart that would give you a tolerance of acceptable slabbed weight with any coin. Now for the part that makes this a ridiculous amount of work... the inserts. Each size coin needs a different insert, which will affect the weight. Granted very little, but hey this is supposed to be a accurate chart to detect fakes. In my eyes this could be an impossible task to be used on a large scale. The kicker is a TPG can change their source for materials at any time, rendering the info outdated. Report this Post to the Staff
Conder101 Bedrock of the Community United States 17884 Posts	Posted 09/20/2013 2:59 pm Weigh the coin and slab, then weigh the coin after you break it out. That way you don't have to worry about missing pieces. Now you also have to worry about the tolerance range of the slab weight. So will be a little heavy, some will be a little light. So I would recommend cracking out at least 100 slabs so we can get a good idea of what that range is. Now also consider that the hole sizes are different for each denomination so the weight of each denomination of slab will also be different. So that is another 100 or so slabs to crack out for each denomination. We should probably run these tests on a couple different generations of slabs as well because there may be a difference in the density of the plastic used in the different generations. And of course we will have to do this for both PCGS and NGC slabs. I think we should probably be able to start getting some good data for a nice table once we've cracked out some 6 - 10 thousand slabs. And then we still have to consider the Weight Tolerance of the coins in the slabs. Report this Post to the Staff
Penny Guy Pillar of the Community United States 531 Posts	Posted 09/20/2013 3:54 pm Then with this information in hand we could proceed with the same sample quantity to chart the mint Weight Tolerance. It probably wouldn't be a bad idea to do a second test to validate the first results. Edited by Penny Guy 09/20/2013 3:55 pm Report this Post to the Staff
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