This is one of the beautiful Constellations sport model I like after the famous 168.005, though many people criticize it's a bit feminine.
The upper one is no question a Great Classic Omega!
The lower one is a later design with a slim profile, the gold bezel was carved with Roman Numerals. This makes the watch less congested with hour indexer and words... There is a "Star" at lower portion of the watch at 6' Oclock position.
Final touch up with four curved Claws to hold the bezel Securely onto the watch case, at same time acts as a protection shoulder for the crown. It's it smart!?
Again, the beauiful watch models were a creation of this greatest watch designer, who had created the legendary AP Royal Oak, IWC Ingeniur, Patek Philippe Nautilus and the Vacheron Constantin Overseas, including these Omegas,as I believe they were all designed by the same person, Gerald Genta.