Omega Seamaster Planet Ocean 600M Co Axial Master Chronometer 39.5mmvsSeiko Prospex Sea Seiko Diver’s Watch 60th Anniversary Limited Edition

The Omega Seamaster Planet Ocean 600M Co Axial Master Chronometer 39.5mm is praised for its excellent finishing and handsome, easy-to-read dial with good lume. Owners find the 39.5mm size suitable for smaller wrists, though some describe it as a chunky or heavy piece. The Co-Axial movement is noted for potentially increasing service intervals. Opinions are divided on the case proportions, with some finding them strange or awkward due to the 14.5mm thickness, while others appreciate its substantial build and comfortable bracelet with a useful micro-adjust clasp, though one reviewer noted a lack of micro-adjustment on the steel bracelet. The "Summer Blue" dial is considered pretty, and the watch retains its 600m water resistance and helium escape valve. One reviewer found a specific brown ceramic and gold combination visually jarring.

The Seiko Prospex Sea Seiko Diver’s Watch 60th Anniversary Limited Edition is praised for its comfortable MarineMaster case design and attractive wave-patterned silvery-white dial with a grey bezel insert. Owners note the 40mm case and 300m water resistance. Some owners criticize the 6R55 movement's accuracy, reporting deviations of +25/-15 seconds per day, and find the watch expensive for a limited edition with a large production run. Overall, owners find the Seiko Prospex Sea Seiko Diver’s Watch 60th Anniversary Limited Edition a comfortable and attractive watch, though some question its value proposition due to accuracy concerns and its "limited" status.