World of Coins

Research and reference => Numismatics => Topic started by: Coinsforever on January 08, 2011, 01:34:10 PM

Title: Mint Error: clashed die vs Ghost Image error
Post by: Coinsforever on January 08, 2011, 01:34:10 PM
Could you please clarify :

1.Basic & technical difference about subject ( clashed die vs Ghost Image error ) mint errors .

2.Another issue is does copper coins errors are much  more in quantity than silver , Nickel and other metals coins . if yes any specific reason behind it.

Refer link

Appreciate response from all experts .
Cheers ;D
Title: Re: Mint error - clashed die vs Ghost Image error
Post by: Figleaf on January 08, 2011, 07:47:26 PM
Clashed dies is what happens if the press "strikes a coin" when there is no flan in the appropriate place. If the clash is hard enough, the dies will receive a faint reflection of the opposite die. This will show up en relief on the coins struck with such damaged dies. Clashed dies are typical of machine-struck coins.

Ghost image is a fanciful name for a double strike, typical for hammered coins. The minter must strike the die/flan/anvil combination with appropriate force. Not enough power will give a vague, badly struck coin. Too much power will give a double strike. The force of the strike will reverberate right back into the hammer lifting it for a split second. The die moves and gets hit a second time in a slightly different place.

Just to complicate things, if the minter decides the coin was badly struck (e.g. the die or the flan was in the wrong position), he may try to correct things with a second blow. Minters were paid by the number of coins produced. This is called an overstrike.

Another related production problem is brockage. This happens when there are two flans under the press at the same time and one of them sticks to the die. The next coin to be struck will show the same side twice, once incuse, once en relief.

As for copper coins, they were held in contempt, sometimes even produced in different mints. They were made with the oldest machines and by second rate staff. Much of this had to do with the fact that the poor used the most copper coins, but also, silver and gold needed more security, making the job socially more prestigious.

Title: Re: Mint error - clashed die vs Ghost Image error
Post by: translateltd on January 08, 2011, 08:13:58 PM
"Ghosting" is a different concept when used to describe bronze coins of Edward VII and George V in particular.  Pennies and halfpennies of 1902-26 often show a hollowed outline of the King's head around the figure of Britannia.   This was attributed to the royal effigy being too large for the flan, and effectively "sucking" metal away from the other side.  It was one of the reasons for the adjustments made to the effigy in 1926-27 and then the reduced size of the effigy from 1928.

The pennies illustrated for these two types in SCWC 2010 (p. 954, KM794.2 and 810) show faint ghosting.  It's not caused by die clashing.

Title: Re: Mint error - clashed die vs Ghost Image error
Post by: Coinsforever on January 09, 2011, 01:15:25 AM
Thanks a lot !