A 7 stamped in the field on the reverse of a 1967 sms Lincoln penny. It is graded ms 68 by ngc

I asked for your opinions about this coin about year ago. I still haven't found out anything about it. So I'm asking for your opinion again. Some thought it may be graffiti. But if that were the case would it get a grade of ms 68? I talked to one individual that thought maybe it was a dropped 7 from a die. Buy obviously it was not from the die that struck this coin. But here's a kicker, there is also a very faint 2 to the right of the 7 but slightly lower. If you blow up the image you can see the 2 but very faint.

I hope you all have a great memorial day weekend

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