This Omega Seamaster Cosmic, powered by the Caliber 752 automatic movement, underwent a complete and thorough service to restore full mechanical function and long-term reliability. The movement was disassembled, with each component ultrasonically cleaned and inspected for wear or damage. The mainspring was removed, cleaned, and lubricated using both braking and mainspring greases, ensuring smooth winding, controlled power delivery, and reduced wear on the barrel wall.
During reassembly, high-quality Moebius synthetic oils were used throughout, and Fixodrop was applied to the escapement to prevent oil migration and maintain consistent amplitude over time. The date mechanism and quickset function were tested and adjusted to ensure smooth operation. After reassembly, the movement was regulated and tested in multiple positions for accuracy. The case, known for its monocoque (one-piece) construction, was cleaned, with only light exterior polishing if needed, preserving the vintage character of this classic Seamaster model.
For more information on initiating the repair of your Vintage Omega see getting started, and additional information on Omega servicing in general. Further reading: Choosing where to have your watch repaired.
This is a well designed movement from Omega. The auto wind ratchet wheel is especially easy to dismantle and service.
Omega Cosmic Background
The Omega Seamaster Cosmic with the Caliber 752 was introduced in the late 1960s as part of Omega’s effort to combine elegant styling with robust functionality. The Seamaster Cosmic line was known for its distinctive monocoque (one-piece) case design, which improved water resistance by requiring access through the crystal rather than a removable case back. Inside, the watch featured the Caliber 752, a 24-jewel automatic movement with a day-date complication and quickset date function, part of Omega’s highly regarded 750 series. With its blend of modern design, reliable mechanics, and practical features, the Seamaster Cosmic 752 remains a standout among Omega’s vintage offerings.