1997 D Penny Doubled Die On Date Or Double Strike

On a doubled die the devices are enlarged, not reduced. On Machine Doubling the devices are reduced. So you have Machine Doubling. Machine Doubling happens after the strike. A slight bounce/swing that is like a kick in the shins. Note on your coin: See on the affected area:
1. The area is flat, shelf like.
2. The contour of the coin is removed on that side of the devices.
3. The overall size of the devices are reduced in size.
On a doubled die, the doubling is on the die and hubbed on to the die, thus the term doubled die. Here is an example:

Note on this doubled die, not just the date is affected:

Even the mintmark is affected:

This is a Doubled die even on the mintmark since 1990, there are no more RPMs, but affect mintmarks are then called doubled dies in 1990 forward coins.

Machine Doubling is very common. Even a doubled die can be affected with Machine Doubling. But your coin is normal, with Machine Doubling that happened after the strike. Just a common coin.

Rather than give a yes or no answer, (which I was not trained with) I give a detailed explanation what I see. That way other can also see what I see, then know when they see it again, what it is. Yes are no answer do one thing. Give the answer. But a teacher will help explain what they are looking at to that when they see it again. Boom, they know what it is. Yes or no answer don't teach. Just my way of paying it forward.

Well all here play on the same team and help out. So it really is, a coin community that really are family.