Don't miss the next drop
There is a particular generation of 1950s Omegas that quietly rewards close looking, and to us this Ref. 2640-10 SC is one of them. The dial has lived a life, the case has been worn properly rather than babied, and the movement underneath is one of the most defensible mid-century calibers Omega ever shipped. The “Jumbo” nickname does the work in the title, but the real story here is the patina pattern across the lower-left quadrant of the dial and the rose-gilt 283 spinning below it.
Omega’s “Jumbo” designation gets used loosely across collector forums, but in the strict sense it refers to the brand’s 36mm steel dress cases of the late 1940s and 1950s, a generation when 33mm was the polite norm and 36mm read as confidently oversized. The Ref. 2640 was one of the references that carried that brief. Introduced in the early 1950s as part of Omega’s pre-Seamaster steel dress catalog, the 2640 used a faceted “spider” lug profile that gives the case its architectural stance in side profile, a detail that comes through clearly when you turn it edge-on under good light. The “-10 SC” suffix on the inner caseback denotes the dial-and-hand variant with sweep center seconds, which is exactly the configuration in front of us.
The movement is the rose-gilt Caliber 283, seventeen jewels, manual wind, center seconds. Omega introduced the 283 in 1953 as a direct descendant of the 30T2 family that had dominated the Kew Teddington and Geneva observatory chronometer trials throughout the 1940s. The 283 carried that DNA forward with a slightly redesigned bridge layout, Incabloc shock protection, and the same generous balance that made the 30-series so quietly tunable. The bridges on this example carry the Omega script along with “17 JEWELS” and a clean serial that places production in the mid-1950s. The finish is the warm rose-gilt that Omega used through the period, and the train sits cleanly under the bridges with no signs of past trauma.
The case is solid stainless steel, 36mm across with a 43mm lug-to-lug, and the inner caseback carries the verbatim stamping “ACIER INOXYDABLE / OMEGA WATCH CO / FAB. SUISSE / SWISS MADE / CH88 / 2640-10 SC” in the layout Omega used for its pre-Seamaster steel references. The outer caseback shows honest scratching and brushed wear, the kind of surface story that tells you this watch lived on wrists, not in safes. The mid-case flanks are polished, the spider lugs retain their faceted shape with light softening at the edges, and the crown is signed with the Omega Ω in good visible relief. The bezel is smooth and fixed, the crystal is acrylic, and the overall wear reads as wonderfully honest for a watch that has spent seventy years in service.
The dial is where this example earns its character. The base finish is a matte cream that has aged unevenly, with a pronounced tropical zone in the lower-left quadrant running from about seven to ten o’clock, where the surface has darkened into a warm caramel mottling that no factory could replicate. Applied gold faceted dagger indices ring the chapter at every hour except twelve, which is marked with a printed Arabic numeral in the script Omega used through the 1950s. The Ω logo and OMEGA wordmark sit at twelve in their period-correct positioning, with “SWISS MADE” printed at the bottom of the dial below the seconds track. Gold dauphine hour and minute hands sweep across the dial, and a thin gold center-seconds hand with a small red tip provides the contrast against the cream field. The small lume plots between indices have darkened with age, sitting as quiet brown dots that read as character rather than damage. This is a factory-original dial with seventy years of patina, not a refinish, and the unevenness is the entire point.
It comes presented on a brown leather strap with cream contrast stitching and a plain steel buckle, an 18mm pairing that suits the dress-case proportions without competing with the dial. We think the cream-and-brown palette earned by the tropical zone calls for warm strap colors generally; a tan, cognac, or honey leather would all sit beautifully here, and we would lean toward smooth or lightly grained calf rather than anything too rustic.
Serviced in-house at OTTUHR and backed by our 2-year mechanical warranty, this Omega Jumbo is for the collector who values a properly aged dial and a defensible mid-century caliber over a perfectly preserved museum piece. To us, the Ref. 2640-10 SC is one of the most quietly compelling steel Omegas of the decade, and this particular example wears its seventy years with the kind of confidence that no restored dial can ever fake.
