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 Replies: 8 / Views: 1,211 |
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New Member
Brazil
31 Posts |
Hello guys, someone already hear about fake coins of the Saudi Arabia 1 Riyal 1935? I have two here that have almost the same weight (0,04gr difference), all fine details are OK, but the thickness is different and in the Bullion Test sound test the silver alloy is a little bit different, anyone can help me? Thanks all. http://en.numista.com/catalogue/pieces14755.html |
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Pillar of the Community
Sweden
1078 Posts |
If the thickness is different then so should the ring test be. I don't know anything about planchet thickness varieties but the only reasonable reason I can think of immediately is wear. Is the thinner coin considerably worm? Does it weigh less as well? How big is the sound difference? Do you have focused images so we can evaluate the situation even better?
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New Member
 Brazil
31 Posts |
Magnetic test all OK, in attachment some pictures of the coins, the quality is not perfect but I think you can have an idea, both are similar in the Grade...The interesting/strange part is that the thinner one have 11,60gr and the thicker one 11,56gr...Difference in the sound is really small, thicker one give 4500 10500 18500 hz and the thinner 4800 10800 18800 hz
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New Member
Brazil
31 Posts |
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Rest in Peace
United States
17900 Posts |
Wow. That is a huge difference on the thickness on the edges. If they don't pull a magnet, I don't know where to go from there. The only answer I might have had was a difference in the upset of the rim from a stronger strike, but it doesn't appear that the thicker one has a markedly better strike.
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Pillar of the Community
Sweden
1078 Posts |
Hmm. I'd say it's got much more upset rims combined with a (slightly) stronger strike. That being said, the weight and sound frequencies are so little off I wouldn't be worried by it. I have some Morgan and Peace dollars with similar sound abnormalities but they seem perfectly legit. Both of your coins seem perfectly genuine to me. The only explanation I have for the weight/thickness difference is that the Saudi mint accidentally made some blanks slightly thinner. |
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Moderator
 United States
34427 Posts |
Quote:
Wow. That is a huge difference on the thickness on the edges . I agree and that would make me very nervous. Both are the same diameter and mass, so by definition, they must have different densities. I would expect one of these to be silver and one to be not silver. "If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
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Pillar of the Community
Australia
3831 Posts |
I think it's a bit too quick to pull the guns on counterfeits. From my experience, it is normal to expect some minor Weight Tolerance. The same also applies to edge. There might be a different collar, different reeding machine, variance in thickness of planchets used. Just too many variables. The sound test may mean something but at the same time, different thickness, slightly different alloy composition etc can all affect the pitch. That said, I'm leaning towards genuine for both coins at this point of time. |
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New Member
Brazil
31 Posts |
Thanks all guys for your thoughts and help, I appreciated and lear a lot with it.
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Replies: 8 / Views: 1,211 |
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Posted 03/21/2016 1:19 pm
