Help with Watch Authenticity - Speedmaster 3511.20

Hi everyone, I recently purchased an omega speed mess at 3511.20 and was wondering if you saw any red flags based on the pictures I uploaded. For some background I bought this watch from what seems to be a reputable dealer where it was inspected and comes with a two year warranty. Based on the pictures in the listing, it seemed to be authentic, I checked for a few things, such as the alignment of the Swiss made at the bottom of the dial, as well as the yellowing of the watch hands, which is consistent with the age of the watch and material used for luminescence. Any help is much appreciated!