Omega Seamaster Planet Ocean 600M Co Axial Master Chronometer 39.5mmvsPatek Philippe Aquanaut 5164

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 Patek Philippe Aquanaut 5164 is widely praised as a comfortable and useful travel tool, with its dual-time zone function described as simple yet brilliant. Owners highlight the watch's exceptional finishing, including sharp brushing and polished bevels, and appreciate the pliant composite strap. The grey-brown dial with a geosphere pattern and white gold indices filled with Super-Luminova are noted as positive features. Some owners find the detailing and finishing to be up to Patek standards, with steel polishing quality exceeding expectations. The watch is considered a great all-rounder, comfortable enough for daily wear, feeling like an extension of the arm. However, the case tends to attract scratches when new, and some owners consider integrated-bracelet-style watches like the Aquanaut a poor choice for rough handling due to the case being integral to the overall appearance. The retail price of the 5164A is noted as significantly higher than some competitors.