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In the 1950s, the average men’s dress watch measured a discreet 33mm or 34mm. To wear a 36mm watch was to make a statement. Today, the Omega Reference 2640 is affectionately known by collectors as the “Jumbo,” and it occupies a sweet spot in the vintage market. It offers the classic, understated elegance of the mid-century aesthetic but with case proportions that feel entirely modern on today’s wrist. It is the perfect bridge between the smaller, more delicate watches of the 1940s and the larger sports watches that would dominate the 1960s.
The case design of the Reference 2640 is a highlight in itself. It often features distinct, slightly faceted or “bombé” lugs that give the watch a muscular, architectural stance. This isn’t just a blown-up dress watch; it is a design that was intended to be robust. Under the hood lies the Caliber 283, a manual-wind movement with 17 jewels. This caliber is a direct descendant of the legendary 30T2 movement family, which famously dominated observatory precision trials throughout the 1940s. The 283 includes Incabloc shock protection, making it a reliable workhorse that was arguably one of the most accurate mass-produced movements of the 20th century.
While dial configurations varied, these “Jumbos” are most prized for their legibility and balance. The dial acts as a wide, open canvas, often featuring applied gold or steel indices that catch the light beautifully against the matte background. Whether fitted with Dauphine or leaf hands, the result is a watch that prioritizes time-telling clarity above all else.
In terms of collectability, the Reference 2640 is a sleeper hit. It offers the same mechanical pedigree as a Seamaster or a Ranchero but often flies under the radar. For the collector who finds standard vintage pieces a bit too petite, this watch offers the perfect solution: authentic history with a wrist presence that holds its own in the modern world.
