I found this 1974 D LMC which is quite thin compared to the other pennies and it weighs 2.85g. Is this a wrong planchet strike or just a environmental damaged penny. Maybe if I cleaned it with acetone the weight may even lower removing all the grime attached.
Thank you for the education all. I am still curious that 2.85g is considered within tolerance for a copper penny? Plus, I hit the penny with some acetone and some interesting features surfaced on the reverse like a clash or doubling?
Your coinhas been exposed to an acidic substance that has eaten it away. That explains the weight loss, and as a note, +/-.13gr is the listed "tolerances", although I would say.3gr is in a normal range.
Sins the rim is still intact, this is most likely a coin buried or spent time in a puddle in the southern US, very acidic soil. If the rim is gone, some missing, that shows a bath in acid.
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