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When these coins are pressed are they a HOT or a COLD press

Posted: Thu Jun 01, 2017 2:36 pm
by Buster_57
When these coins are pressed are they a HOT or a COLD press..
If it is a Cold press - than how can they cause so much damage to the
coin???

Please see attached photo of an 1973 P with coin / Press Damage

Sincerely: Buster

Re: When these coins are pressed are they a HOT or a COLD pr

Posted: Thu Jun 01, 2017 7:08 pm
by AndyO
The planchet is struck at room temperature, under quite a bit of tonnage. The hardness of the CuNi planchets are far less than that of the dies, and are very ductile. This in turn allows the planchet metal to fill the die cavities when struck (squeezed) - profile, eagle, letters, etc.

Basically, the hammer and anvil dies are going to close to a predetermined height. The edge of the planchet is formed with other dies to make the reeding. So, anything left inside the die area with the blank planchet is going to "leave a mark" so to speak. This is why grease struck throughs look so "wavy" with lots of small dings/scrapes - which are the original annealing marks that were prevented from being struck out by the grease being against the die face.

Any metal in the line of fire is almost certainly going to be of higher hardness than the planchet, and therefore it leave clear indents in whatever shape it is. The hard die pushes the less hard metal debris into the even less hard planchet. The die retracts, the coin and debris are ejected. The debris likely falls out or is washed out later on. Occasionally a struck through coin is out there with the retained debris.

Re: When these coins are pressed are they a HOT or a COLD pr

Posted: Thu Jun 01, 2017 10:17 pm
by Buster_57
" So the crack running from his eye - down the side of his nose to his lips could very well be a piece of string or a metal shaving that caused that type of damage?? " If so how did it find it's way into a mint pack - aren't all error coins supposed to be kicked out and not sold at all - and since they had so much trouble with the Ike's any in 71 and 72 - 73 was the first year Ike's were placed into mint packs and they were suppose to be that only the perfect coin's [MS 62's ] or better made it to the mint packs. ??

BTW -- Thank you so very much - I learned a lot tonight - again - Thank you..

Sincerely: Buster