Omega Speedmaster | Rare Split-Seconds Chronograph | Rattrapante I Ref 3540.50I

Specifications

Reference

3540.50

Case Size

Approx. 42–43mm

Case Material

Stainless Steel

Dial

Black Carbon Fiber Style Dial

Crystal

Sapphire

Bezel

Fixed Tachymeter

Movement

Omega Caliber 3600 Automatic

Functions

Hours, Minutes, Small Seconds, Chronograph, Split-Seconds (Rattrapante)

Power Reserve

~42 Hours

Water Resistance

~100 meters (10 ATM)

Lug Width

20mm

About This Watch

The Omega Speedmaster Ref. 3540.50 stands apart from traditional Speedmasters with its rare split-seconds (rattrapante) chronograph complication—a feature typically reserved for far higher-end, haute horology pieces. This function allows the wearer to measure multiple elapsed times simultaneously, making it not just visually striking, but mechanically impressive. Introduced around the late 1990s, this model represents Omega pushing beyond the classic Moonwatch formula into more advanced chronograph engineering. Visually, the watch carries a bold and slightly more modern presence compared to standard Speedmasters. The carbon-fiber style black dial adds depth and texture, while the layered chronograph hands hint at the complexity beneath the surface. The case design, reminiscent of the X-33 era, gives it a more technical and tool-oriented aesthetic, paired with a tachymeter bezel that maintains the Speedmaster’s racing heritage. Inside, it is powered by the Omega Caliber 3600 automatic movement , based on the robust Valjoux 7750 architecture but heavily modified to incorporate the rattrapante function. This movement delivers reliable performance with added mechanical intrigue, offering both everyday usability and collector-level complication. It’s a watch that flies under the radar, but for those who know, it represents one of the most unique Speedmasters ever produced. Condition Please review the photos carefully for an accurate representation. Light scratches or signs of wear consistent with age and normal use may be present and do not affect functionality. Technical Data Reference: 3540.50 Case Size: Approx. 42–43mm Case Material: Stainless Steel Dial: Black Carbon Fiber Style Dial Crystal: Sapphire Bezel: Fixed Tachymeter Movement: Omega Caliber 3600 Automatic Functions: Hours, Minutes, Small Seconds, Chronograph, Split-Seconds (Rattrapante) Power Reserve: ~42 Hours Water Resistance: ~100 meters (10 ATM) Lug Width: 20mm