There are scientific techniques for determining the date, such as X ray crystallography, but such are outside the normal demands of the coin collector.
The metal under the date would be less compressed than the metal next to the date, and so would show up in the test technique suggested. I do not think that the coin is anywhere near valuable enough to justify such a test.
Unless you suspect that to be some really rare coin, the best thing to do is write a date on it with a felt tipped marker. You could try many different methods but usually the cost of such things would make it all not to worth the cost.
In this condition it's worthless. My mom had found it and gave it to me. I just wanted to get a date off it out of curiosity. Someone had told me olive oil for a few days, rubbing on date with my thumb once a day.
I'll get some more pics tonite. I let it soak overnite in olive oil and rubbed it. Most of the corrosion has come off and you can see copper now, still no help really with date.
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