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Pillar of the Community
United States
567 Posts |
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New Member
 United States
6 Posts |
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Moderator
 United States
56855 Posts |
Link not working for me. John1  |
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Moderator
United States
56855 Posts |
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Pillar of the Community
United States
3253 Posts |
Now that's some unique coinage!
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Pillar of the Community
United States
4212 Posts |
I'm secure in the knowledge Sap will appear soon. Just when I've pulled about the last hair out, he saves my wig.
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New Member
United States
6 Posts |
Here's another link I found last night. http://www.thaibankmuseum.or.th/eng/museum108.phpThe description and photo there match the object I have. Quote:
Chiang money was of higher value. It bore two attached horseshoe shapes, with two large notches in the middle. A coin could be divided into smaller parts by cutting it at the notches; the ease with which it could be broken indicated the quality of its silver content. Both sides of Chiang money were imprinted with three marks, indicating its weight and denomination |
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Pillar of the Community
United States
3486 Posts |
I am surprised that no one has said it yet: "How does a TPG slab that coin?" jrl10137, That has got to be one of the most interesting coins that we have seen of the CCF. Thanks for sharing. To the others, Just how would one go about authenticating this? I suppose an accurate weight should be determined. Then specific gravity test. |
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Pillar of the Community
United States
3486 Posts |
How to test specific gravity: http://www.youtube.com/watch?v=xYdSEAm-7uI78 grams/weight in water = specific gravity. 10.5 is the specific gravity of pure silver. This video may not be entirely accurate, see comments, but the approach is sound. |
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Pillar of the Community
United Kingdom
2838 Posts |
Quote:
That has got to be one of the most interesting coins that we have seen of the CCF. I agree, very nice thing to have  |
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New Member
United States
6 Posts |
Thank you for that video. I followed the instructions on measuring specific gravity. The scale I have isn't accurate enough to say for sure but the object measured 60 grams, and the object suspended in water raised the weight 6 grams so that gives a rough estimate on the specific gravity of 10. I need to find a more accurate scale but with what I have available to me at the moment it appears it passed this test.
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Valued Member
United States
385 Posts |
Verifying the authenticity of this coin could be determined through the process of water displacement.
You'll need:
A liquid container with mL markings (meniscus)
A gram scale accurate to 0.01grams
The density of water is 1g/1cm cubed.
Your initial volume should be 0mL, go ahead and add 5mL of water (or distilled water for better precision). Then put in your coin, record the difference in volume.
The equation for density of d (rho) = m/v (mass divided by volume), units should be in grams (g) and centimeters squared (equivalent to 1milliliter mL).
Go ahead and take the mass of the coin (by using a gram scale) and divide it by the volume difference that you calculated, this should give you the density.
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Pillar of the Community
United States
3486 Posts |
Also, the temperature of the water should be as close to 4 degrees C / 39 F as possible.
At least for a specific gravity test.
silverdollar2011,
Do we not need to know in advance the density of pure silver?
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New Member
United States
6 Posts |
So I need to find a more accurate scale... any recomendations?
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Valued Member
United States
331 Posts |
It's listed with a photograph in R. Leonard's book "Curious Currency". It's called a K'a K'im. The notes read as follows "Even odder than bullet money is the K'a k'im of Northern Thailand. These curious rings - split and bent into the shape of a women's pelvis-were used as money circa 1325 to 1545. They are stamped with a denomination, dynasty symbol, and name of the mint city." This sounds logical since Chiangmai is a popular Thai tourist destination.
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Posted 01/16/2013 8:25 pm
