Is this a 1990 Lincoln Memorial no S proof ?

Hello and welcome to Numista!

I'm afraid that's just a regular Philadelphia mint penny. Proof 1990 pennies have a cameo finish where the field is mirror finish and the devices are matte (frosted) like finish. Here's a picture of a proof.



Why do you think it's a proof?

Thanks for answering my question. I’m new to collecting and couldn't tell difference between Philly and more rare variation.