jhhlai
Joined: 25 Haz 2017
Posts: 25
Posted: 2 Eyl 2018, 03:51
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I came across this one recently.
Could it be caused by a variation of metal or impurities?
ALLRED1950
Joined: 2 Tem 2012
Posts: 5049
Posted: 2 Eyl 2018, 19:24
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Hello jhhiai
This coin is a brass plated steel coin. The bubbles are from a bad plating. Something was under the brass, water or some gas.
It is, what it is, or is it.
Choucas
Closed account
Posted: 2 Eyl 2018, 23:17
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Apparently bubble like this can be caused by some gas during the melting processus of the planchet, plated or not.
ALLRED1950
Joined: 2 Tem 2012
Posts: 5049
Posted: 2 Eyl 2018, 23:24
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Or pressing the coin. When they are pressing and putting on the images. There is a lot of pressure and heat.
It is, what it is, or is it.
jhhlai
Joined: 25 Haz 2017
Posts: 25
Posted: 3 Eyl 2018, 01:56
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Thanks for your information.
Used time zone is UTC+2:00.
Current time is 07:47.
