Author Topic: Error: Partial reeded edge ,5 rupees coin  (Read 497 times)

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Offline vdhinesh79

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Error: Partial reeded edge ,5 rupees coin
« on: October 02, 2018, 07:18:45 PM »
is half reeded edge coins more common than fully reeded edge coins, i have 1995 5 rupee coin and k kamaraj 5 rupee coin

Offline dheer

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Re: half reeded edge ,5 rupees coin
« Reply #1 on: October 03, 2018, 02:59:53 AM »
Half reeded are not common.

Reeded edges are more common in some issues than others
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Offline vdhinesh79

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Re: half reeded edge ,5 rupees coin
« Reply #2 on: October 03, 2018, 06:13:27 AM »
so how much rare do you think are half reeded coins of 5 rupees of 1995 and k kamaraj

Offline vdhinesh79

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Re: half reeded edge ,5 rupees coin
« Reply #3 on: October 03, 2018, 06:25:29 AM »
this is not my image ,this is how my coin looks

Offline Figleaf

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Re: half reeded edge ,5 rupees coin
« Reply #4 on: October 03, 2018, 08:02:56 AM »
It looks like it was intended that this could would receive a security edge. To understand what happened, you should know how such an edge is made. First, the obverse and reverse are struck (first machine). If the coin is pulled from the production at that point, it will have a blank edge. Five rupee 1998 is known with a blank edge. Next, the edge is reeded (second machine). If the coin escapes to circulation at that point, it will of course have a reeded edge. Five rupee 1998 is known with a reeded edge. Lastly, the middle band with the dots is applied (third machine) and the coin will have a security edge. Most 5 rupee 1998 coins have a security edge.

The third machine malfunctioned when the coin you show was made. Not sure what the malfunction was. Perhaps the coin was not perfectly level with the "knife". This sort of error occurs regularly. See here for another example. Also, demand for such errors is limited. However, they are nice discussion items to explain to non-collectors how a security edge is made.

Peter
« Last Edit: October 03, 2018, 12:18:54 PM by Figleaf »
An unidentified coin is a piece of metal. An identified coin is a piece of history.

Offline dheer

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Re: half reeded edge ,5 rupees coin
« Reply #5 on: October 03, 2018, 08:53:11 AM »
so how much rare do you think are half reeded coins of 5 rupees of 1995 and k kamaraj

How much rare is a relative question. In such cases every coin is different. To my knowledge these are not collectibles. Complete reeded are collectibles.
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Offline vdhinesh79

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Re: half reeded edge ,5 rupees coin
« Reply #6 on: October 03, 2018, 09:18:07 AM »
what about half reeded kamaraj 5 rupee coin

Offline kansal888

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Re: half reeded edge ,5 rupees coin
« Reply #7 on: October 18, 2018, 06:19:52 PM »
It looks like it was intended that this could would receive a security edge. To understand what happened, you should know how such an edge is made. First, the obverse and reverse are struck (first machine). If the coin is pulled from the production at that point, it will have a blank edge. Five rupee 1998 is known with a blank edge. Next, the edge is reeded (second machine). If the coin escapes to circulation at that point, it will of course have a reeded edge. Five rupee 1998 is known with a reeded edge. Lastly, the middle band with the dots is applied (third machine) and the coin will have a security edge. Most 5 rupee 1998 coins have a security edge.

The third machine malfunctioned when the coin you show was made. Not sure what the malfunction was. Perhaps the coin was not perfectly level with the "knife". This sort of error occurs regularly. See here for another example. Also, demand for such errors is limited. However, they are nice discussion items to explain to non-collectors how a security edge is made.

Peter

Dear Peter

Your explanation does not hold true at least for India.

Three machines are not used. Only two machines are used.

After upsetting, the blanks are fed in the first machine where inclined V shaped lines and dots are engraved on the edge of the blanks.

The blanks are then fed into a coinage press. Here obverse and reverse sides are struck with obverse and reverse dies respectively. Simultaneously a collar die or a third die is used on the edges to make the milling lines. The collar is in three pieces. It has parallel lines. When the blank is struck with the obverse and reverse dies, it expands slightly due to huge pressure. After expansion, the blank fits into the collar and the parallel lines are engraved on edges.

If the blank misses the first machine, it will show a normal reeded edge instead of security edge.

Regards

Sanjay Kansal


Offline Figleaf

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Re: half reeded edge ,5 rupees coin
« Reply #8 on: October 18, 2018, 11:55:53 PM »
I am not convinced the order is of great importance, but I love to find out even small details.

While the order you describe explains milled edge errors nicely, it fails to account for blank edge errors, unless you come up with a double mistake, that is statistically highly unlikely. It also does not explain why (to my knowledge) we do not hear of grooved, but un-reeded error coins, which would in your scenario be the result of a single error of e.g. fitting the wrong collar or a broken collar.

Peter
An unidentified coin is a piece of metal. An identified coin is a piece of history.