2015 penny

[Mormik]

This is a 2015 nmm penny. The clad is missing in places on both sides

[MintErrors]

In my opinion, this pennybsuffers from verdigris contamination. This condition can happen when copper coins are subject to high humidity, and possible exposure to salt air. Other possibilities are bad handling and improper storage, like extreme temperature chaGrey.

Verdigris on one coin can contaminate other copper based coins. I suggest keeping it away from other coins, especially copper.

Missing clad layer usually shows Grey. It could very well have been a strike that was stronger than normal, breaking the copper layer and exposing the zinc core. If conditions are met, a blueish stain looking material, which is the zinc core can leak from the interior of the coin.