Pressed pennies are made in a hand crank pressed penny machine.
The pennies are a novelty/souvenir and the machines are often found at zoos, museums, tourist attractions, etc.
The one I used is in my local dairy queen. So the four options at this machine were an ice cream cone with Soldotna, dairy queen written on it, a moose and bear that say Kenai peninsula Alaska, and fish that says Kenai river.
You crank it until it lines up with the arrow for the design you want.
Then you put in a penny and 2 quarters.
Crank it around and it spits out your penny that has been pressed.
There is a place ~ 1-1/2 hours from me called the sea life center.
I've heard they have a pressed penny machine that has sea otters, walrus, etc.
Pressed pennies are just cheap souvenirs.