Omega Constellation Observatory Co-Axial Master Chronometer 39.4mm O‑MEGASTEEL Pie-Pan Green Dial 140.13.39.21.10.001

The Omega Constellation has been one of Swiss watchmaking's most enduring icons since its debut in 1952, born out of Omega's ambition to create a watch that would dominate precision trials at the Geneva and Neuchâtel observatories. The "Observatory" name in the title of reference 140.13.39.21.10.001 is therefore more than marketing language — it is a lineage claim rooted in decades of chronometric trophies and a direct link to the original Constellation's observatory certification heritage. Today the line continues that mission with the Master Chronometer standard, independently certified by METAS (the Swiss Federal Institute of Metrology) to confirm accuracy, magnetic resistance, and power-reserve performance at a level few manufactures can match.

At 39.4mm, the case of the Constellation 140.13.39.21.10.001 occupies exactly the right space between classic dress proportions and modern wrist presence. The case is crafted in O‑MEGASTEEL, Omega's proprietary stainless steel alloy developed for superior hardness, a sharper polish, and greater scratch resistance than conventional 316L steel — a material choice that reinforces the watch's premium positioning without adding unnecessary weight. The integrated stainless steel bezel frames the dial with clean architectural lines, echoing the four-claw "Griffes" design that has defined the Constellation silhouette since the 1960s.

The green pie-pan dial is the aesthetic centerpiece of this reference and one of the most talked-about contemporary interpretations of a vintage Constellation detail. The original pie-pan (or "tarte tatin") dial of the 1950s featured a gently domed, stepped surface that caught light across multiple planes, creating depth and visual dynamism long before the era of elaborate guilloché. Omega has faithfully re-created that geometry here and rendered it in a rich, saturated green, a color that speaks equally to collector nostalgia and current fashion in horology. Index hour markers provide clean, legible timekeeping without interrupting the architectural beauty of the sunburst finish.

At the heart of the Constellation 140.13.39.21.10.001 is Omega's Co-Axial Master Chronometer movement, a caliber that incorporates the Co-Axial escapement invented by George Daniels and developed by Omega to dramatically reduce friction and extend service intervals compared to traditional lever escapements. Master Chronometer certification demands that the movement pass eight METAS tests, including resistance to magnetic fields of 15,000 gauss, a threshold that renders it effectively impervious to the magnetic fields encountered in everyday life — from smartphones to airport security equipment. This is a watch you can wear with complete confidence in its timekeeping day after day.

The alligator leather strap completes the package with a touch of understated luxury, pairing naturally with the dressy character of the green dial and providing extraordinary comfort on the wrist. Because this is a new-production piece, it arrives in full Omega presentation, allowing the buyer to register the warranty and enjoy complete peace of mind from day one. Whether you are a seasoned Constellation collector drawn to the heritage pie-pan dial revival or a first-time buyer seeking a versatile, certified-precise Swiss watch that will hold meaning for decades, reference 140.13.39.21.10.001 is a compelling choice.

At Bizak & Co. we specialize in sourcing brand-new and pre-owned Omega watches at the best possible prices, and we back every sale with expert authentication and attentive client service. Browse the Omega Constellation collection on bizakandco.com, or reach out directly — our team is ready to answer questions, confirm availability, and guide you through purchasing reference 140.13.39.21.10.001 with confidence.