World of Coins

Research and reference => Numismatics => Topic started by: dheer on October 15, 2012, 05:50:39 PM

Title: Definition for Right Metal in Wrong Blanking Machine
Post by: dheer on October 15, 2012, 05:50:39 PM
I know that OMS error [Off metal Strike] is when the sheet metal used to blank coins for a particular denomination are put into other.
For example an SS metal normally used for Indian Rs 1 is put into a Blanking press for Rs 2 [the intended metal being Cu-Ni] and these coins are then struck with a Rs 2 die. Thus these coins become OMS.

The other case is a normal Rs 1 planchet that by error enters into the press meant for striking Rs 2 coins ... these become the "Struck on Wrong Planchet" errors

What would be error type be when a metal in this case Cu-Ni is the right metal for Rs 2, was put into a blanking machine of size for Rs 1, the coins were struck correctly with Rs 2 denomination.
Title: Re: Definition for Right Metal in Wrong Blanking Machine
Post by: yougotmi on November 09, 2014, 04:19:02 PM
I was reaing more on the shape of 2 rupee National Integration coins and came up with an interesting fact on the below website:

http://en.numista.com/catalogue/pieces27568.mobile.html#lien_infos_techniques

Country India - Republic
NumberKM# 121
Year1982-1990
Value2 Rupees 2 INR = 0.033 USD
Metal Copper-nickel
Weight7.95 g
Diameter 28 mm
Thickness1.93 mm
Shape Round
 Orientation Medal alignment ↑↑

The round shape were minted in the years 1982 and 1990.  If the coins one has in round shape apart from these 2 years, then its an error coin.
Title: Re: Definition for Right Metal in Wrong Blanking Machine
Post by: dheer on November 10, 2014, 04:32:33 AM
Yes the round shapes were only for 2 years.
After that the shape of the coin was 11- sided.
Quite often one has come across coins that are round in shape across different years / mints.
Yes these are definitely errors. The question is what type of errors should one call them?
Title: Re: Definition for Right Metal in Wrong Blanking Machine
Post by: yougotmi on November 10, 2014, 06:09:36 AM
II was watching a documentary on National Geography about minting of coins. The edges are milled with the help of machinery and thus the edge takes its shape.  Probably, it can be called milled error.