1971 S Lincoln Memorial RPM?

Well I notice you are looking on the outsides of the devices/mintmark as well. On the devices and mintmarks you need to look at spread. An enlarging of the devices on to show that the die was hub doubled, or the mintmark had s spread between punchings. I'm not seeing either on this one. When I say spread, it would look like this:
Note on the first images the mintmark sizes. Note the die is showing slight doubling on the date area, but the mintmarks are punched into the die later is a separate step. If the die were doubled and the mintmark isn't that is normal for a doubled die back then. Since 1990, the mintmark and the die hub process is not separate steps.





See what I mean at looking on the centers of the devices and not on the outside edges. Machine Doubling most of the time found there. So if you don't see spread on a coin, move on to the next one. As if you keep looking, guess what you'll find? Machine Doubling. Centers of the not the edges. Hope this helps. Sometimes look here and then there, you loose perspective. That is why I like the side by sides, because can see both images at the same time. Your brain then sees what is different.