Author Topic: YSK Year 3 1 Yuan, Authentic ?  (Read 3059 times)

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Offline Little Finger

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YSK Year 3 1 Yuan, Authentic ?
« on: October 11, 2015, 10:14:39 AM »
Hi all, kindly let me know your opinions on this one. Is it real or fake ?

Weight is 25.9g and non-magnetic.

Offline poconopenn

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #1 on: October 11, 2015, 03:58:39 PM »
Fake, based on the reedings.

Offline Little Finger

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #2 on: October 11, 2015, 08:09:45 PM »
How should the reedings on a real one look like ?

Offline poconopenn

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #3 on: October 11, 2015, 09:53:39 PM »
First picture is for genuine and second picture is for fake.

Offline Little Finger

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #4 on: October 11, 2015, 10:51:28 PM »
Ok thanks, so basically the reeding of the fake is more rectangular and uniform while the real one is more uneven and "organic" ?

Offline TomG

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #5 on: October 11, 2015, 11:48:52 PM »
Also see: http://china-mint.info/forum/index.php?topic=5785.0

The correct weight of 1914 Yuan Shih Kai silver dollar should be from 26,5g to 26,9g. Diameter should be from 38,50mm to 39mm and thickness: 2,5mm

Offline Little Finger

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #6 on: October 12, 2015, 05:57:49 AM »
From what I learnt from other collectors, a weight variance of + or - 5% is an acceptable indication, is this correct ?

Offline TomG

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #7 on: October 12, 2015, 10:40:50 AM »
Hello,

±5% seems a reasonable approximation for weight indication, when accounting for the wear and tear of circulation. But for a coin with little or no wear, a low weight would be a cautionary signal.
PCSG uses 26.4g as reference weight.  Using a range of 26.5g - 26.9g, the average weight would be 26.7g. ±5% would be ±1.335g with really only one significant digit after the decimal place. This would place the coin at the low acceptable range of 25.4g - 28.0 (25.365g-28.035g).

With the suspicious reeding and low weight for a lightly worn coin, these combined indications would seem to reinforce a conclusion of a problem coin. At this point, check the diameter and rim thickness to check for disguised weight from over-sized dimensions. Specific gravity measurement should also confirm if composition is close to a 90-10 silver-copper alloy.

Tom G.

Offline Little Finger

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #8 on: October 12, 2015, 10:52:49 AM »
Thank you sifus for the insights.

Offline Little Finger

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #9 on: October 15, 2015, 11:21:58 AM »
And by the way what is a "Specific Gravity measurement" ?

Offline TomG

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Re: YSK Year 3 1 Yuan, Authentic ?
« Reply #10 on: October 15, 2015, 01:16:06 PM »
For more detail on specific gravity measurement see:
http://china-mint.info/forum/index.php?topic=11456.0