You're showing the 1977-S Proof; I believe that "Lego" was referring to the business strikes. ~ Chris PS. The image in your first post is just a damaged "D".
1977 S Lincoln Memorial Cents were struck only as Proof coins. Your Cent is not a Proof Cent. https://www.usacoinbook.com/coins/543/small-cents/lincoln-memorial-cent/1977-S/
The top of the D took a hit so it's damaged. The second set of photos show a 1977-S but that's a proof and only the S mintmark was made in San Francisco in proof. Your coin is a business strike so it's a D. Welcome to CT.