odd 1955D penny

[swish]

Hi all.
I dug this 55D today. at first glance it looked like a double die. after cleaning i saw that it wasn't. but take a close look at the rim on the front and back. it looks to be double stamped. anyone see one like this before?

 

[thrillathahunt]

It looks like an encased cent that was removed from it's encasement. Pennies were pressed in an aluminum encasement and given away as advertising pieces back in the day.