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If you are going to experiment, use something that will not itself leave scratch lines. I would suggest diamond dust paste in 5,000 grit upward from a lapidary shop or ebay, or use a plastic repair kit that removes scratches from plastic. The alumina oxide is very carefully meshed to not leave other than extremely small microscopic scratches. Put the coin and agent in a small ziplock and keep it in your pant pockets for a while.
Come to think of it, the plastic scratch remover I used in a different thread on polishing scratches out of slabs would work. The key is to remove the obvious scratches, but not so much activity to "polish" the coin. Thin line.
Theoretical solution, your mileage may vary.
Jim
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