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Nova Constellatio. There are a number of varities.
I don't think the baking soda technique works with copper Based on the picture, I don't think you can do anything to improve it.
Thanks Is it worth anything or can I go to town on copper cleaning techniques?
Agreed!I would leave it as it is, Novas are important in U.S. coinage history, as they were some of the first coins that were made after the U.S. gained its Independence, they are hard to find and fairly rare as well. Also any sort of cleaning may wipe away any details that are on the coin. If I were you I would display it just like that, it is a great find and you probably don't want to try the wrong cleaning technique and ruin it.
No, don't use baking soda. That is for silvers. Use either a soft toothpick or Andres pencils (look them up.)
Nice find!
Congrats on a cool very special coin! I see three paths forward. 1.) keep as is, this is the safest approach, maybe coat with Renaissance wax to preserve the details and stop flaking. 2.) very, very lightly use the soft Andres pencil, maybe it will remove some of the brown and create a more consistent green as there is a good chance that most of the detail is supported precariously in the verdigris. 3.) more aggressively use the soft Andres pencil to remove most of the crust and verdigris and hope you have a decent amount of details left then coat with Vaseline and polish.
In restoring that coin, for more details, remember cleaning it will de-value it more. But, if done
by professionals, you could get it graded/valued then..., slab it, and put it in your safety deposit box...!
Valuable coin - great Find!
I am thinking of sending it into pcgs for restoration if possible and grading. i would do this to protect the coin, confirm it is the actual coin, and still be able to show it off. is this the recommended approuch?