This Omega Seamaster Diver 300 M Professional Co‑Axial Chronometer presents a formally restrained appearance tied to Omega’s modern dive-watch lineage. The watch is distinguished by a presentation inscription on the case lugs reading “NOT FOR SALE,” a mark of its use in marketing or promotional contexts before entering private hands. Powered by Omega’s Co‑Axial chronometer specification, the movement reflects the brand’s focus on chronometric performance and extended service intervals. For a contemporary collector, the watch offers an intersection of familiar Seamaster design language and an unusual provenance detail that documents a specific chapter in the watch’s life.