France, 10 centimes 1976 with convex edge?

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I have a coin of 10 centimes from France, of 1976.
It looks exactly like all other 10 centimes coins, except that the edge is convex.
That is, if a normal coin, seen at the edge, looks like this:

Normal coin:

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mine looks like this:

1976 10 centimes coin:


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(
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(I hope you get the idea, just with my silly ASCII art!)

To me, it seems so unlikely it to be a fake, as it has a very small value.

Does anybody know about the existence of such features (convex edge) in some of those coins?

Thanks!
I've never heard of this coin with a convex edge. Yes, it's very unlikely to be a fake as 10 centimes were basically worth nothing. I don't think that could be a minting error either. Could it be wear?
Could you post a picture?
Hi!

Here are some pictures.

In each picture I tried to put the "strange" one (10 centimes 1976 with convex edge) on the left and the "normal" one (a 10 centimes 1994) on the right:


notice the highlights on the edge!


(in this picture the "strange" one is the one displaying the obverse "10")

notice that the rim looks a bit thicker on the "strange" coin




Weight is the same for both coins within a precision of 0.1 g.
Metal looks the same to me (the "strange" coin is a bit consumed and oxidized).
So, it seems not to be a wearable coin either (those kind of things are usually lighter, thinner and made of some cheaper metal).

Thanks for any suggestion!
OK it's not wear, the edge is too smooth and round and the rim thicker. The reference book doesn't mention any variety for 1976:
http://www.lefranc.net/monnaie,10-centimes-marianne,144.html
Then I have no idea what it is. Maybe you can ask in the French section, there are many knowledgeable people there who may not read the English section.
Hi All

I have seen coins with a similar edge that have come from the waterpump of a washing machine. Or out of an area where it has been rotated constantly for quite some time. It looks similar to me in the attached picture.
Ex-South African now living in Germany
Quote: "BryanJ"​ OK it's not wear, the edge is too smooth and round and the rim thicker. The reference book doesn't mention any variety for 1976:
http://www.lefranc.net/monnaie,10-centimes-marianne,144.html
​Then I have no idea what it is. Maybe you can ask in the French section, there are many knowledgeable people there who may not read the English section.
​Thanks!
I posted the question at:
https://fr.numista.com/forum/topic60856.html#p499237
Quote: "Pcoetzee5"​Hi All

​I have seen coins with a similar edge that have come from the waterpump of a washing machine. Or out of an area where it has been rotated constantly for quite some time. It looks similar to me in the attached picture.
It could be, actually. But probably in such case the edge should look shining like if it was new. It looks to be consumed exactly like the other parts of the coin, instead (it could be consumed while circulating some time after having passed through the washing machine).
Yes, frankly I think it's a possibility.

Thanks!
If you look at the head side of the coins, you will see the rim is wider, and from the side, the coin is thicker. And I am sure, when you measure it, it will be slightly smaller and thicker.

I like these type of coin finds. Just shows that we live and use coins.
Ex-South African now living in Germany
Back in the day, here in the USA, you would take a spoon and a copper or silver coin. You would beat down the edge and then drill out the middle to make a ring.
Library Media Specialist, columnist, collector, and gardener...
Quote: "Oklahoman"​Back in the day, here in the USA, you would take a spoon and a copper or silver coin. You would beat down the edge and then drill out the middle to make a ring.
​I know of a coin shop that has a whole shelf of those.
Jamais l'or n'a perdu la plus petite occasion de se montrer stupide. -Balzac
Here's an old thread about similar coins. I thinks it 'post mint damage'. Pity that my network doesn't let me open the link in the final post.

https://en.numista.com/forum/topic3935.html
Quote: "ArnoV"​Here's an old thread about similar coins. I thinks it 'post mint damage'. Pity that my network doesn't let me open the link in the final post.

https://en.numista.com/forum/topic3935.html
As suggested by Joe-breuille in this post , these look like corroded with some acid or base.
(About the thread you suggested, I cannot open the last post either; probably the link is broken...)
Quote: "ArnoV"​Pity that my network doesn't let me open the link in the final post.

​Probably something wrong with the link itself, I can't open it either.
Here's a link to a page with lots of examples and a 'scientific' theory how they come about.

https://www.coincommunity.com/forum/topic.asp?TOPIC_ID=143863
Quote: "Mr. Midnight"
Quote: "Oklahoman"​Back in the day, here in the USA, you would take a spoon and a copper or silver coin. You would beat down the edge and then drill out the middle to make a ring.
​​I know of a coin shop that has a whole shelf of those.
​Ugh it hurts! IT HURTS! :snif:

I'm interested in this water pump though...I'm having trouble picturing it. How does the rest of the coin stay so in tact?

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