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1909 "Silver" Jamacian Penny - Idea's

 
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510 Posts
 Posted 12/06/2019  6:03 pm Show Profile   Bookmark this topic Add moose59 to your friends list Get a Link to this Message
I went to a local coin shop to day and purchased some coins. One of them was this 1909 "silver" penny. Now a regular penny from Jamaica is copper/nickel, weighs 8.1g and is 30.9mm. The one I purchased is 9.3g and 30mm. Not a huge difference but enough.

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 Posted 12/06/2019  8:30 pm  Show Profile   Bookmark this reply Add Spence to your friends list Get a Link to this Reply
Hmm, are you thinking that it has been plated?
"If you climb a good tree, you get a push."
-----Ghanaian proverb

"The danger we all now face is distinguishing between what is authentic and what is performed."
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 Posted 12/06/2019  10:01 pm  Show Profile   Bookmark this reply Add moose59 to your friends list Get a Link to this Reply
Not really sure. I will be taking it back and seeing if he can put it on his testet
Edited by moose59
12/06/2019 10:02 pm
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 Posted 12/07/2019  04:33 am  Show Profile   Bookmark this reply Add Spence to your friends list Get a Link to this Reply
Ok yes good idea. I'll be interested to see what metal is on the surface of this coin.
"If you climb a good tree, you get a push."
-----Ghanaian proverb

"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz

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Australia
16349 Posts
 Posted 12/07/2019  07:28 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
I feel reasonably confident that this coin has not been plated. The extra mass of 1.2 grams is much more than be accounted for, with plating.
I would also find it reasonably difficult to explain why a white metal alloy coin should be plated with a white metal.
I would expect that XRF testing would reveal a standard alloy of 75% copper, 25% nickel for this coin.

Weight needs to be re confirmed on a different accurate mass balance.
If correct, I suspect that a wrong planchet was fed into the coining press. This happenstance is not unique; it happened (rarely), when The Royal Mint was executing coin orders for many countries around the British Empire.
It still happens occasionally, although less often.
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 Posted 12/07/2019  1:13 pm  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
Very interesting. Agree that 15% difference in mass, if correct, is way too much for plating, but is exactly right for the difference between cupronickel alloy and silver.
Edited by tdziemia
12/07/2019 1:15 pm
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 Posted 12/08/2019  05:26 am  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
The possibility that it may be silver needs to be investigated. XRF would reveal the presence of silver or not.
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