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Albert's Last 20 Posts
| 1920 Fat Man Dollar PMD Or Otherwise?
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Albert
Pillar of the Community
United States
1805 Posts |
 Posted 02/22/2025 11:13 am
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Readily found in many sizes.
Something about diamagnetic coins is that the idea is to see if a reaction does or does not happen. If it does not, unlikely the coin is silver. But if it does, it is not proof the coin is silver at all. Other elements can give similar or confusing results such as aluminum and copper. That's why follow-up testing by other means is needed as a next step or two.
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| | Forum: World Coins and Commemoratives |
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| 1920 Fat Man Dollar PMD Or Otherwise?
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Albert
Pillar of the Community
United States
1805 Posts |
Posted 02/21/2025 06:45 am
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One aspect of a ping test some don't think about is the duration.
I have fakes that ping nicely but the duration quickly falls off way too soon.
The spectrum above shows 7 peaks instead a single.
One single peak showing the harmonics trailing off.
I'd be curious how the coin reacts in the presence of a suspended N-52 magnet.
Or on a magnet slide. |
| | Forum: World Coins and Commemoratives |
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| 1920 Fat Man Dollar PMD Or Otherwise?
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Albert
Pillar of the Community
United States
1805 Posts |
Posted 02/20/2025 10:09 pm
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For the most part, classic USA silver is 90% silver with the other 10% being copper.
Specific gravity can support that.
The coin in the OP could have a mix of quite a few metals (maybe as much as 11).
If silver, as the gadget shows, my doubts remain.
Take the reading on the gadget.
Then see if specific gravity is 10.31
I appreciate the close-ups of those odd marks.
I snapped a bunch of those when making this binder:
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| | Forum: World Coins and Commemoratives |
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| 1920 Fat Man Dollar PMD Or Otherwise?
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Albert
Pillar of the Community
United States
1805 Posts |
Posted 02/20/2025 1:01 pm
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I think it looks like a cast fake.
When or what cause the damage who can say?
I deliberately damaged some of my cast fakes just to expose the insides.
Maybe wrong, been there before.I have my doubts.
This piece should be 39mm, .890silver, 2 1/2 mm thick and weighs 27grams |
| | Forum: World Coins and Commemoratives |
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| Asian Cash Type For Identification - 10 X Examples
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Albert
Pillar of the Community
United States
1805 Posts |
Posted 02/16/2025 4:25 pm
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This coin is probably Qing Dynasty
Emperor De Zong 1875-1908
Guang Xu tong bao
Hartill 22.xxxx
Could be Boo yuwan or chiowan
But chiowan descends farther below the square hole
I was led astray because the inscription matches some Vietnam coins, and after studying Vietnam (slapping my forehead), I realized it has a Qing dynasty mint mark.
Another excuse is that the Guang Xu is so poor it can be easily confused with similar Vietnamese & Chinese characters written in different styles.
I have no doubt others were trying to pin this one down.
I hope they post and say what they were finding.
Took me a while only to find it's not old at all.
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| | Forum: Identification: Unidentified Coins, Medals, and Tokens |
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| Asian Cash Type For Identification - #5/11
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Albert
Pillar of the Community
United States
1805 Posts |
Posted 02/14/2025 5:20 pm
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It's Ming dynasy Hong Xi tong bao, but not readily found among some reference books.
Maybe because it's regarded as a counterfeit or copy.
So online may have better search results.
Update: It is seen in Schjoth as Hung-hsi t'ung pao 1168 & 1169
Emperor Jen Tsung AD 1425
Note: I came back because I did not look in Schjoth the first time around. Also I was much confused with the unusual Top & Bottom characters that did not seem to go together in the places first searched. However, it is shown in Schjoth. |
| | Forum: Identification: Unidentified Coins, Medals, and Tokens |
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