I don't know if I would risk taking a 1803 larger dollar and messing around with it with liquid nitrogen. If I were you, I would show it the photo of California's governor and wait the acrylic to jump towards the photo leaving the coin nice and clean.
If you know someone who works in a dental lab, they will have a water grinder for model & die work, the water grinder will grind through and hit different angles until it delaminates. I once ground a .380 pistol out of something like that.
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