Posted 07/05/2023 07:46 am
Is that steel or aluminum diamond plate of a rubber mat? If it is one of the first 2, you should put a soft cloth down to avoid scratching the coins you are interested in.
We will need better images in order to help you out here. It is difficult to determine what is going on.
But you should not be seeing any zinc though. This coin is made from a mixture of different metals:
Content:88.5% copper, 6% zinc, 3.5% manganese, 2% nickel.
It could be a carbon spot on the coin.
Collecting since 1972. Learning from then on
"Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin
7070 type set coin count: 51/76
Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars
Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents
"Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin
7070 type set coin count: 51/76
Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars
Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents
