No, it's just a common Philadelphia minted cent. They made 6.8 billion of them. There is a rare 1990 "No S" cent but it is a proof, not a business strike. Your's is a business strike.
Did you guys see the three lines beaming off of linclon face and chin. It looks like other letters are on coin. Appears to be an ear on the back of neck
Circulation grime. Your Cent is a normal Copper Plated Zinc Cent. They are not restruck or reprocessed. Never. Not a Mint Error
Both of those are normal business strike cents minted in Philadelphia. Neither is the rare no S proof. Sorry.
It's usually damage. There are lists and pictures and explanations of errors. Read up on that it's interesting.
I have many 1990 no mint mark Lincoln pennies and much more I do have one with around chin area three lines look. Like number and the L is miss in Liberty and top hair line is missing die