Don't miss the next drop
This Omega bumper automatic is, in our opinion, one of the more interesting transitional pieces in current vintage Swiss collecting, because every observable detail on the watch places it before the formal commercial launch of the reference it would otherwise be identical to. Calibers do not appear the same day as the references they power. Cases get produced in batches. Casebacks get pulled from earlier stock. Dial printing gets revised in waves. The watch in your hands when all of those pieces come together can sit, quite literally, on the wrong side of the official launch date of the model line it belongs to, and the physical evidence on this piece tells that story cleanly enough that we are content to let the watch make the case itself.
Omega introduced its first date wristwatch in 1952 with the Seamaster Calendar ref. 2627, a 35mm bumper automatic with a date aperture at 6 o’clock. Almost every documented production example of the 2627 carries the words “SEAMASTER” and “CALENDAR” on its dial, the two signatures Omega chose to mark the line’s commercial debut. The small number of US-market variants that did not carry the Seamaster signature still carried Calendar branding or some variation of the model identification. This watch carries neither. The dial here reads only “OMEGA / AUTOMATIC” beneath the applied Ω logo, with “Swiss Made” at the foot, and a gold-bordered date window at 6. No Seamaster branding. No Calendar text. No sub-line identification of any kind.
The caliber 353 inside this watch was introduced in 1950 and ran at 19,800 vibrations per hour for a 17-jewel bumper automatic with roughly 42 hours of power reserve. It was Omega’s first calendar-equipped automatic and a direct descendant of the cal. 28.10 RA that powered most Omega bumper automatics through the mid- and late-1940s. The 353 added a date module and revised the bridge layout to accommodate the date wheel and quickset corrector, but its rose-gilt bridge finishing, oscillating bumper winding mass, and anti-magnetic shielding all carried over from the 28.10 RA generation. Open this watch and the bridges show that exact rose-gilt copper tone, with “OMEGA WATCH Co” engraved across the main bridge and the characteristic bumper winding pawl visible at the lower edge of the movement plate.
The case is stainless steel, 35mm across, with the elongated curving lugs typical of early-1950s Omega case work. Twist the watch into side profile and you find an Omega-signed crown carrying the applied Ω logo, sitting between cleanly defined lug shoulders that show honest wear from seven decades of being worn and enjoyed. The bezel is smooth polished steel, the case sides show light surface marks consistent with the watch’s age, and nothing about the case shape has been compromised by aggressive polishing. The inner caseback is where the story sharpens: machine-stamped “ACIER INOXYDABLE” arcs across the top, with the Omega triangle logo and “OMEGA WATCH Co”, “FAB. SUISSE”, and “SWISS MADE” stacked in the center, and the reference number “2438-2” stamped clearly below. The 2438-2 was Omega’s mid-1940s time-only bumper reference, designed for the cal. 28.10 RA and never originally specified for a date movement. Below the reference, machine-stamped into the metal, sits the numeral “141”, oriented inverted relative to every other marking on the caseback. The depth and uniformity of that stamp rule out a casual watchmaker’s service mark, and its inverted orientation points to a production-stage decision, consistent with a caseback being selected from existing 2438-2 stock and married to a 2627 case during the transitional window.
The cream dial wears its decades with quiet dignity. Applied gold markers sit at every hour, with shorter faceted gold blocks at 12, 3, and 9, and elongated faceted gold daggers at the remaining eight hour positions. Small oxidized lume plots sit adjacent to each marker, radium that has slowly aged into a rust-toned record of the watch’s age. The gilt dauphine handset is original, with light surface oxidation that reads more as character than as wear. The applied Ω logo sits sharp above OMEGA / AUTOMATIC printing that has not been retouched. The gold-bordered date window at 6 frames a clean wheel with crisp dark numerals. There is no auxiliary printing, no minute track around the outer edge, and nothing on this dial that was added by a later hand.
We are presenting this watch on an OTTUHR ostrich strap in olive with green contrast stitching, finished with an OTTUHR-signed pillow buckle. The olive picks up the cream of the dial without pulling the watch into a costume, and the green stitching keeps the assembly from reading too dressy for the bumper automatic underneath.
Serviced in-house at OTTUHR and backed by our 2-year mechanical warranty, this Omega bumper automatic is the kind of transitional-period piece that almost never surfaces with the evidence still in place. The 2438-2 caseback. The cal. 353 inside. The unbranded OMEGA AUTOMATIC dial. The inverted “141” stamp. For the collector who values a watch that sits at an inflection point in horological history rather than at a marketing milestone, this Omega is, to us, one of the more compelling early-Seamaster-Calendar conversations on the current market.
