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Coins Mania's Last 20 Posts

1920 Fat Man Dollar PMD Or Otherwise?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/22/2025  09:17 am
OENdsPTnufI


Hope it helps.
Forum: World Coins and Commemoratives

1920 Fat Man Dollar PMD Or Otherwise?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/22/2025  01:29 am
Diamagnetism is the property of materials that are repelled by a magnetic field, due to the induced magnetic field in the opposite direction.

I do not have a N52 slider. But it rocks because it repels. If it is paramagnetic it will weakly attract e.g. Tungsten. The video clearly show it is not Ferro.

Wish I have access to an XRF metal analyzer to measure and breakdown the elements composition. I don't.

Thanks to your photo illustration. Need to buy a proper N52 to do. Good Night.
Forum: World Coins and Commemoratives
 
1920 Fat Man Dollar PMD Or Otherwise?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/21/2025  11:35 pm
I dismantled an old spoiled Hard Disk Drive to remove the Neodymium magnet inside. Tested on this coin.

J0MivQeIIwk


I balanced the coin on my finger tip while avoiding direct contact. There isn't any knocking or touching of the magnet against the coin, if there is the coin would dropped from my finger pivot. Moving back and forth the magnet creates a changing magnetic flux to cause the rocking of the coin. Otherwise the coin is not attracted to the magnet.
Forum: World Coins and Commemoratives
 
1920 Fat Man Dollar PMD Or Otherwise?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/21/2025  04:46 am
Manage to get hold of a subscriber to ping test the coin with the correct 1920 FatMan Dollar Apps. I have no idea what alloy formula can emulate exact ping and pass Sigma for .900 Ag (Sigma doesn't have .89 Ag selection)? I will perform a specific gravity test when I have the necessary apparatus.



In between, the frequency spectrum looks much cleaner compared to when using the wrong Morgan Apps earlier in the thread.
Forum: World Coins and Commemoratives
 
1920 Fat Man Dollar PMD Or Otherwise?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/20/2025  10:55 pm
@ Albert

Is the binder available for public?

Thanks
Forum: World Coins and Commemoratives
 
1920 Fat Man Dollar PMD Or Otherwise?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/20/2025  9:28 pm
@Albert

Here are the closed up images, as best as I am able to take.




I apologise I followed up with lengthy thread and more photos as well.
Here the Reverse:


Looks like gas occlude across the diameter?

View from the other side



Otherwise the ping test is either Great or Good (I use Morgan which is free because I am not a subscriber). I am not sure a Silver Cast would give the same frequency as it is a function of density and more importantly Modulus of Elasticity.


Diameter 38.7mm, thickness measured at raised Rim is 2.4mm and thickness measured at background field is 2.2mm.


Forum: World Coins and Commemoratives

1920 Fat Man Dollar PMD Or Otherwise?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/20/2025  09:28 am
PMD or otherwise? Quite difficult to tell from an untrained eyes
Pictures below:







Forum: World Coins and Commemoratives
 
Malaya King George VI Silver Coin: How To Distinguish Proof From Normal ?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/13/2025  01:28 am
Thanks Hondo,

How a proof ones looks like? Any marking to distinguish?

Regards
Forum: World Coins and Commemoratives
 
Malaya King George VI Silver Coin: How To Distinguish Proof From Normal ?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/13/2025  12:31 am
I can't find related materials, can someone help. I am keen to learn as I have a bunch of these type.


Numista shows there are proof coins for the 10cents

mine example:

Obverse

Reverse

Closed up

I heard some of these proof went into circulation. But most are kept by the British during Colonial Singapore. Can someone with a known proof coin show photos to compare?

*** Moved by Staff moved to a more appropriate forum. ***
Forum: World Coins and Commemoratives
 
China Sinkiang 5 Mace Silver Coins - Genuine ?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/04/2025  02:10 am
At last Here I found some information on these exotic coins!

https://www.zeno.ru/showgallery.php?cat=4382
Forum: Ancient, Greek, Roman, and Medieval Coins
 
China Sinkiang 5 Mace Silver Coins - Genuine ?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/03/2025  02:14 am
@Spence

Only when I get back to the seller to purchase the coins, then I am able to do a specific gravity test. The heavier coin looks just slightly thicker when placing both coins side by side for a comparison. How much should I pay for for non-graded ones?
Forum: Ancient, Greek, Roman, and Medieval Coins

China Sinkiang 5 Mace Silver Coins - Genuine ?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 02/02/2025  08:42 am
Hi Everyone,

Here are 2 pieces of the SinKiang 5 Mace Silver coin; are they Genuine? What is the market value for these pieces?

The 1st piece, weight is 18.8 g





The 2nd piece, weight is 16.8 g





Thanks You!
Forum: Ancient, Greek, Roman, and Medieval Coins
 
1920 Straits Settlement 1 Cent; How Is This Peculiar Shape Possible?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 11/04/2024  05:42 am
Instead of being squarish, it is parallelogram, bigger but thinner. It lays flat on table top. Weight is correct.

I wish someone has an idea of how it can happen and can it be classified as an error type.
Forum: Tokens, Medals, Challenge Coins, and other Exonumia
 
1920 Straits Settlement 1 Cent; How Is This Peculiar Shape Possible?
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 11/03/2024  09:53 am
Weight is 5.8g on a 1 decimal scale. Thickness is evenly 1.5mm



I have one normal coin place side by side for comparison.





Reverve in close shot


Can anyone explain? Thanks
Forum: Tokens, Medals, Challenge Coins, and other Exonumia
 
Date Of This Indian Temple Token
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 09/02/2024  09:14 am
Hi there,

Could anyone tell me the date of this Indian Temple token?





Weight is 9.5 grams, Diameter 28.4mm & thickness is 2.1mm

Thanks

*** Moved by Staff moved to a more appropriate forum. ***
Forum: Tokens, Medals, Challenge Coins, and other Exonumia
 
Need Help In Identification Of This Medal (Id: 19th-20th Century French Agricultural Medal)
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 06/21/2024  05:46 am
Oh yes. That's me. Someone asked me to contribute to the Numista catalogue as this wasn't recorded.
Forum: Tokens, Medals, Challenge Coins, and other Exonumia

Need Help In Identification Of This Medal (Id: 19th-20th Century French Agricultural Medal)
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 06/20/2024  08:45 am
Thanks everyone!
Forum: Tokens, Medals, Challenge Coins, and other Exonumia
 
1900 Straits Settlements Queen Victoria 1 Cent Missing Features
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 06/19/2024  09:29 am
Hi all,

I ve' got this 1900 Straits Victoria 1 cent with missing features on the obverse at the back of the neck. I hope it is an error type.


The Obverse with missing features at the back of the neck


Side by side comparison with a normal coin


The reverse of the coin

The coin weighs 9.3g. What do you think?
Thanks You
Forum: World Variety and Error Coins
 
Need Help In Identification Of This Medal (Id: 19th-20th Century French Agricultural Medal)
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 06/08/2024  01:13 am
@Jecz79

That is very helpful. Picture of the edge:


Forum: Tokens, Medals, Challenge Coins, and other Exonumia
 
Need Help In Identification Of This Medal (Id: 19th-20th Century French Agricultural Medal)
Coins Mania
Valued Member
Singapore
150 Posts
Old Post Posted 06/04/2024  06:39 am
Hi all,

I can't find this in numista. Can someone help? Weight is 57.7g diameter 49mm, thickest thickness is 3.9mm, otherwise the fields is 3.0mm thick.
What is the material of the medal?




Thanks
Forum: Tokens, Medals, Challenge Coins, and other Exonumia



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