Turkey 1 lira 2011 bear - Brass -mono-metallic?

[ZYV]

The coin.

[ZYV]

Coins of this emission with weights.
To compare.

[ZYV]

Origin of the coin: from bank coin roll.

[Figleaf]

You need to find a 26 mm brass coin or medal that was struck more or less in the same period by the same mint. If you can do that, you can argue that the coin was struck on the wrong planchet.

Unless you found the coin in a roll yourself, you should consider that the seller has a vested interest in saying that the coin was found in a roll.

Peter

[ZYV]

You need to find a 26 mm brass coin or medal that was struck more or less in the same period by the same mint. If you can do that, you can argue that the coin was struck on the wrong planchet.

"Mono-metallic" coin was made as bi-metallic: inner circle and outer rings.
Its weigt is smaller.
 

[ZYV]

Unless you found the coin in a roll yourself, you should consider that the seller has a vested interest in saying that the coin was found in a roll.

I know seller 20 years, he is my friend.
I don't think he say a lie.

[Figleaf]

"Mono-metallic" coin was made as bi-metallic: inner circle and outer rings.
Its weigt is smaller.

I'll try to be clearer. Such bi-metallic coins are usually made by feeding a pill and ring into the press. They are put together and struck in a collar. Because of the pressure of the strike and the collar, the metal of the pill and the ring are pressed together. To help that process, the pill and ring have matching blips and cavities. The important thing to remember is that both parts are struck together.

There are in theory three option to explain what you show: the ring is discoloured, the ring is in the wrong metal or the whole coin was struck on the wrong flan. The first two options mean that the coin you show consists of two parts. The third option means it was struck on one single flan. As far as I can see on your picture, the coin does not have two parts. If so, the dies were applied to the wrong flan.

This is always possible. A wrong flan can be introduced in a bunch of already mounted correct flan sets (pill and ring together). However, for this option to become likely, it is important to find out which coin or medal the wrong flan was meant for. Since you have size and weight of the flan and you know which mint struck the coins in approximately which years, that should not be too difficult.

Since the flan is in the wrong metal, it is logical that it has a different weight.

Peter

[ZYV]

Dear Peter, thank You very much for the answer!

As far as I can see on your picture, the coin does not have two parts.

As I see on coin - it has 2 parts.
2 parts made from brass.

Do You see fingerprints on coin?

[Figleaf]

If the coin has two parts, it is problematic.

The problem is the ring. Pills are not cut from round pieces of metal, but from plates. Therefore, there are no rings in the metal of the pill lying around in the mint. Also, remember that pills and rings have blips of metal and cavities to hold the pill in place and make sure pills cannot be rotated within the ring. In theory, a wrong sheet of metal could have been used for cutting rings. However, cutting rings goes with great speed and the plates are pretty big. In other words, it is just about impossible that nobody would notice. You'd have to pick up a wrong ring and hide it into a bunch of correct rings to even get it to the press, not even mentioning quality control. That would be hanky-panky, not an error.

Another possibility is that the coin is covered with a layer of metal to make it look mono-metallic. This would dull the details and I don't see that on your coin, but that may be wrong. In any case, a doctored coin would not come out of a coin roll.

Peter

[ZYV]

Dear Peter, thank You very much for answers!

So, we have a unique piece.

[ZYV]

One more such problem:
http://coins.su/forum/index.php?showtopic=84672

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Again Turkey but this time in a white metal. Sorry, but this one looks funny also. Like the people on that forum, I would advise you not to spend too much money on it. It is too easy to achieve this effect with some metallic paint or electrolysis.

Peter

[ZYV]

Dear Figleaf,
do You really think, that "some metallic paint or electrolysis" can make weight of the "brass" coin smaller?

The coin is from mint roll, I have no doubts in that.

[Figleaf]

I was referring to the coin on the Russian forum. My doubts on your coin are based on being unable to come up with a credible scenario of how this could happen. As one of the participants in the Russian forum says, all kinds of bimetallic "errors" are offered, but the weird ones cannot be trusted and there is little interest in them. In countries with a lot of corruption, such "errors" can be made on order in the mint. You will find examples on this site.

Peter

[ZYV]

...such "errors" can be made on order in the mint...

That is probable.
But - where are sistrers & brothers of the "brass" coin?
I made this theme to see them.