Yuck. Looks more concrete or putty.
📋 Item Submitted
1960 D lincoln penny back seems to be a blob error
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
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1966 lincoln penny, believed to be double die.
Perhaps. Don't see that it adds value here.
1989 D over S penny
This is likelier damage than an over date.
1914 gold $2.5 indian head
It has $330 of gold but could be worth $350 or more to a collector. Do you have others?