I found this small date Lincoln Memorial cent roll hunting,and I'm not sure if this is a mint mark, or not It kind of looks like an S to me,but I'm not sure. Let me know what you think.
Sorry that is Machine Doubling. How can I tell? The affected areas are all reduced from die movement after the normal strike. Basically those devices are damaged. On a doubled die you would see the devices enlarged, showing a spread on the devices. Note how the devices are wider than normal, also showing notching on certain areas on the devices. Your coin is not showing a spread on the devices, just reduction on that area of the devices.
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