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Following the release of the two replica Rolex Daytona "Le Mans" models—one in white gold and the other in Everose gold—enthusiasts have largely focused on their soaring market prices. Indeed, both "Le Mans" models have lived up to the hype, with actual market values ​​exceeding one million; notably, the Everose gold version commands an even higher price than the white gold one. Today, however, I want to share some details regarding the brand-new technical features of the Calibre 4132 found in the replica Rolex Daytona "Le Mans." Rolex’s formidable overall strength is built upon a cumulative series of such innovative technologies.

Beyond its aesthetic differences from standard Daytona models, the "Le Mans" edition also differs in functionality. The small chronograph sub-dial at the 9 o'clock position on the "Le Mans" model tracks 24 hours (a nod to the 24-hour endurance race), whereas the corresponding sub-dial on standard models tracks 12 hours. It is precisely this functional distinction that led to the use of a new movement designation—Calibre 4132—for the "Le Mans" model (compared to the 4130/4131 found in standard versions).

The standout technical feature of the Calibre 4132 in the Rolex Daytona "Le Mans" is its innovative "planetary gear" mechanism for the 24-hour chronograph function. By comparing the architecture of the standard Daytona’s Calibre 4130/4131 with that of the "Le Mans" Calibre 4132, the difference becomes immediately apparent: while the 4130/4131 movement employs a standard 12-hour chronograph intermediate wheel, the 4132 utilizes a "planetary gear" system to convert the 12-hour cycle into a 24-hour one.

One might ask: since converting a 12-hour chronograph to a 24-hour one could theoretically be achieved simply by adding a few gears and altering the gear ratio, why did Rolex go to the trouble of designing a specific "planetary gear" system? Rolex has always prioritized controlling the thickness of the Daytona and ensuring the serviceability of its movement; consequently, the 4130/4131 movements employ a unique gear train layout. Rolex positioned the entire chronograph gear train on the back of the movement (the assembly side)—including the 12-hour chronograph gear—resulting in an exceptionally compact design. In contrast, typical chronograph movements place the hour-recording gear on the dial side (driven directly by the mainspring barrel); while this design is simpler, it falls short of the Rolex Daytona in terms of movement thickness and ease of maintenance. However, this "ingenious design" presents one specific challenge: there is absolutely no extra space to accommodate even a single additional gear.

As you can see, the fake Rolex Daytona features a compact 40mm case and a thickness of just 12.2mm (with 100-meter water resistance)—setting a benchmark that is virtually unsurpassed among sports chronographs. To minimize thickness, the 4130/4131 movements utilize a vertical clutch mechanism offset from the center; to eliminate the "jitter" of the chronograph seconds hand upon activation replica watches, they employ a chronograph seconds wheel with elastic teeth (manufactured via LIGA lithography); and to facilitate maintenance, the entire chronograph gear train is located on the back of the movement, allowing the full assembly of chronograph components to be viewed once the automatic winding mechanism is removed.