Cortebert Sport Automatic Bumper - Patina Cream Dial - Stainless Steel - Circa Late 1940s to Early 1950s

When the Italian Navy commissioned Rolex to build watches for their combat frogmen in the late 1930s, the movements at the heart of those watches were not Rolex's own. They were Cortébert calibers, the sixteen-ligne pocket watch movements Rolex bought from the small Swiss manufacture in the village of Cortébert and modified into the Caliber 618 that powered the Panerai references 3646, 6152, 6154, and 6152/1, the most coveted military dive watches in the history of horology. Cortébert was the supplier. Rolex was the assembler. That arrangement quietly underwrote some of the most valuable watches that ever come to auction, and the same manufacture that supplied those movements also produced wristwatches under its own name. This is one of them.

Cortébert was founded in 1790 in the Bernese Jura village that gave the company its name and grew across the nineteenth and early twentieth centuries into one of the most respected railroad watch makers in Europe, supplying the Turkish, Italian, Polish, Serbian, and Egyptian rail systems with the precision pocket watches that timed their networks. Their movements were good enough that Soviet Russia approached Cortébert in the early 1920s for help building a domestic watch industry, licensing the Caliber 616 to be produced in Russia as the Molnija. Mussolini's Italy required foreign brands to operate under Italian names from 1927 onward, and Cortébert distributed there as Perseo, a relationship that continues with the Italian railway system to this day. By 1944 the company produced twenty different calibers and was supplying Rolex with the movements that ended up on the wrists of frogmen in the Mediterranean. Cortébert ceased production during the quartz crisis of the mid-1970s.

The watch is a Cortébert Sport Automatic from the late 1940s or early 1950s, the period when the company was producing some of its finest wristwatch movements alongside the railroad and Rolex contract work. The dial is cream with applied Arabic numerals at every hour position, the lume in each numeral aged across seven decades into a warm tan that reads as gilt at first glance but is the patina of the original luminous compound rather than gold printing. The cardinal numerals at twelve, three, six, and nine are slightly larger and rendered in the distinctive Art Deco style that Cortébert favored on their Sport line. CORTEBERT is signed in cursive at the upper center, SPORT printed in block beneath, and AUTOMATIC at the lower half of the dial. The outer minute track carries railroad-style graduations with the seconds numerals at every fifth position. The hour and minute hands are sword-style with central lume strips that have aged to match the numerals, and the long thin sweep seconds hand is blued steel. SWISS is printed at the bottom of the dial.

The movement is a Cortébert bumper automatic, the semi-rotor design that swings approximately two hundred and seventy degrees and rebounds against spring buffers at each end of its travel, the technology that bridged manual wind and full rotor automatics across the late nineteen forties and early fifties. The movement is signed CORTEBERT WATCH Co. / SEVENTEEN 17 JEWELS / UNADJUSTED / SWISS / A.51220 and the spring buffers are clearly visible through the open caseback. The case is round stainless steel with shaped lugs that flare outward, the inside of the snap caseback stamped CORTEBERT WATCH Co. / SWISS / 548553, and the outside stamped 8522 / STAINLESS STEEL. The watch is running well at the time of listing.

The bracelet is a period stainless steel expansion bracelet with a feature you rarely see surviving on watches of this age. Each link carries cutout windows set with what appears to be mother-of-pearl or abalone shell inlay, the natural material catching light in shifting greys, browns, and hints of blue depending on the angle. Inlay bracelets of this type were sold as upgrades through jewelers in the late 1940s and 1950s, fitted to dress and sport watches at the buyer's request, and surviving examples with the inlay intact and the expansion still functional are uncommon. The bracelet adds a quiet handmade character to the watch that a steel link bracelet of the same period cannot match.

Terms: Please review all photos carefully as they are a part of the listing. This is a vintage timepiece. Accuracy, power reserve, and water resistance are not guaranteed. Vintage watches may require periodic service. Performance can vary with wear, temperature, and position.

I am happy to service any unserviced watch listed on the site, please inquire about service charges when purchasing.

All sales final.