Omega
Dynamic Bullseye Blue 41New Old Stock - 2 Original straps

Omega Genève Dynamic Ref. ST 166.039 Pre-Owned (1969) elliptical “ergonomic” steel case, 41 × 36 mm, automatic Omega cal. 565 movement date at 3 o’clock plexiglas crystal monobloc case/ Unishell case (front-opening through the crystal). Supplied with two original straps: a blue perforated tang-buckle strap and a steel bracelet with deployant clasp. New Old Stock / near-new condition, Mostra luxury presentation case.

“In the 1970s, design didn’t merely soften the edges: it invented new shapes that permanently changed how the world was perceived, and the atmospheres of everyday life.”

The late 1960s didn’t just change music and car lines; it changed the way useful objects were drawn. Everything became bolder, more functional, more daring. In an architect’s studio, on a drawing board, in a saturated-colour advertisement, the same idea returns: form must serve the gesture. The Dynamic was born exactly there, in that moment when we stopped making cases “round by tradition” and created an elliptical case because it felt more natural on the wrist. The first time you put it on, you understand: it doesn’t merely “sit” on the arm, it settles in. The curve follows anatomy; the absence of visible lugs gives the impression of a continuous object, almost monolithic, like an industrial design piece of the era. And then there’s that delightful detail, so typically Omega: the idea that you can change personality without changing the watch. One day, the blue perforated rally-style strap—lively and sporty; the next, the steel bracelet with deployant clasp—more urban, more architectural. The same Dynamic, two lives, one language: that of a luxury that dares to take shape.

The Genève Dynamic was developed at the 1967–1968 turning point and presented to the public in 1968, at a time when Omega was exploring a “younger”, more contemporary aesthetic within the Genève line. The design is associated with the work of Raymond Thévenaz, with one obsession: comfort and legibility, leading to that famous elliptical shape born from a study of wrist anatomy. The case uses a Unicoc / monobloc construction and opens from the front, through the crystal, using a dedicated tool often referred to as Tool 107. The watch carries reference 166.039, paired with the automatic cal. 565 movement with date. Within the same first-generation “Genève Dynamic” family, depending on configuration and movement, other references are often cited together, such as 135.033 and 136.033 (manual-wind versions depending on configuration), as well as 165.039 and 166.039 (automatic versions). Year ranges vary by reference and variant, and the most accurate identification is ideally done via serial number / archive extract.

The steel “ellipse” case has rare presence: about 41 × 36 mm, with that typical Dynamic “large-diameter” feel, while remaining extremely wearable thanks to its curvature and strap integration. This lugless construction reinforces the seventies look: a continuous, deliberate, obvious shape. The movement is Omega cal. 565, an automatic known for its robustness, often described as having 24 jewels and a frequency of 19,800 vibrations per hour, and fitted with a date at 3 o’clock. It’s exactly the kind of engine you want in a collectible watch you actually wear: reliable, stable“true Omega”. The crystal is generally plexiglas on these generations, consistent with the period aesthetic and the front-opening case architecture. The defining construction feature is the monobloc / Unishell architecture, which requires a specific opening method and appropriate tooling, often referenced as Tool 107 in documentation and among collectors. The Dynamic is also a design watch because it treats the strap as a style component. Omega offered perforated “one-piece” straps, often in a synthetic material such as Corfam on certain versions, with a sporty, very 1970s look, as well as integrated steel bracelets with deployant clasps. Your example brings together precisely that duality: a more casual, colourful wear with the blue perforated tang-buckle strap, and a more urban silhouette—almost a steel jewel—with the original steel bracelet.

It’s an ideal watch for those who love character pieces without tipping into excess. It works with a turtleneck, a short jacket, an oversized blazer, an open-collar shirt, raw denim, and even with a more dressed-up outfit where it becomes “the design detail”. It has that rare quality: instantly recognisable, yet never loud. In a rare New Old Stock / near-new condition—which is especially sought-after for a Dynamic—the sharpness of the edges, the surface grain, the freshness of the dial and the comfort of the straps all come into their own. The watch is delivered with its two original straps (blue perforated tang-buckle strap and steel bracelet with deployant clasp) and a Mostra luxury presentation case.

Buying from Mostra means choosing rigorous selection and a recognised customer experience: advice, support, follow-up, and transparency. Customer reviews are verified and rated 5 stars, and every watch sold comes with an exceptional three-year warranty, rare in the pre-owned market. Mostra: renowned for its service and customer experience, has been recognized in the specialist press as the pre-owned specialist.