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Help identifying these marks?

Does anyone recognize what these marks are? Could they be grease on the die? I found several of these in an OBW roll of 2006-P nickels. Thanks for your help.

Looking for info on MN national banknotes from New Ulm, Sleepy Eye, Mankato, Hanska, and Lake Crystal. Also Two Harbors, Duluth, Brainerd, and Ely.
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Hoard the keys.
<< <i>Could they be grease on the die? >>
yup.
.
<< <i>
<< <i>Could they be grease on the die? >>
yup.
. >>
Agree.
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire
Worry is the interest you pay on a debt you may not owe.
"Paper money eventually returns to its intrinsic value---zero."----Voltaire
"Everything you say should be true, but not everything true should be said."----Voltaire