Corum Romvlvs Chronograph - Service in our workshop

Watchmaking always has a special magic when you open a watch with character. And the Corum Romvlvs Chronograph certainly falls into that category. A watch designed to stand out - not only design-wise with the Roman bezel and the special minimalist, "organized" dial, but also mechanically, with a Swiss heart that demands respect and precision in maintenance.

First contact and diagnosis

The watch arrived at the laboratory with obvious micro-scratches on the case, signs of daily use on the bracelet, and most importantly with reduced timekeeping performance, inaccurate chronograph operation and possible damage to the seal. Our first move was to take timekeeping measurements on the timegrapher - the results showed low amplitude and a slight deviation in rate stability, signs that the lubrication was tired and that the watch needed a full service, not a "freshening".

At the same time, we examined the button and crown system to identify possible oxidation or poor resetting of the pushers. The watch had a hard feel to the time buttons, indicating either dirt in the chronograph mechanism or a tired restoring spring. So the diagnosis was clear:

• 📌 Total disassembly mechanism
• 📌 Cleaning - inspection - relubrication - adjustment
• 📌 Service on the chronograph unit
• 📌 Waterproofing with flange replacement
• 📌 Finishing / polishing of case & bracelet

Each step would have to follow the manufacturer's protocol to return the clock not just to operation, but to its factory dynamics.

Opening and dismantling

The process began with carefully opening the rear screw case to avoid any further damage to the finish. Corum uses an external cap that often seals strongly, so applying the correct torque was critical.

Upon opening, we were "welcomed" by a movement with a pure Swiss industrial finish - large plates, symmetrical layout and an obvious modular chronograph system. No unnecessary extremes, but with a clear design that shows that the watch was built for serious and repetitive maintenance.

We began disassembly by removing:

• Brasels, bezel and external systems
• Chronograph buttons & crown
• Automatic Rotor Winding Rotor
• Drive bridges, chronograph system, and train wheel
• Balance module & escape wheel system
• Barrel and mainspring

Each screw and part was put in a special identification device (movement tray and parts cups), so that its position is never lost. If there is a motto in "open surgery" watchmaking, it is order before operation.

Cleaning and control

All metal parts were put in the washing machine with special chemicals for watchmaking parts. This flow was combined with mechanical cleaning of pivot points to remove old oils and residues that are often trapped in modular chrono systems.

After washing, inspection under a 10×-40× stereoscope followed:

• 🔍 Check in:

• Chronograph wheels (wear / teeth deformation)
• Lever reset spring & vertical coupling system
• Pusher feel and return tension
• Jewels and bearing wear
• Pivot condition and any micro-distortions
• Condition of the mainspring inside the barrel
• Shock protection system

At this stage we do not "listen" to the clock, we read it. Just as the doctor reads the tests, we read the signs of fatigue, friction and minor stresses.

Reassembly and lubrication

The clock was rebuilt from scratch. Starting with the barrel/central spring, we installed a new Moebius 8201 so it would have proper torque and healthy amplitude.

Then, we fertilized with surgical precision:

• Pivot points → 9010
• Escape system & chrono clutch → D5
• Modular chronograph coupling system → 941
• Keyless works → 9501
• Barrel wall and main spring housing
• Rotor ball bearing → LUBETA V106

Lubrication is not just "putting oil on". It's putting the right oil in the right place and in the right amount.

Timekeeping and calibration setting

With the movement now fully assembled and clean, it went back to the timegrapher with measurements at the 5 positions:

• 📊 New indications:

• Amplitude: clearly improved and stable
• Beat error: corrected to zero
• Rate: set within COSC tolerances
• Stability: excellent improved curve

The chronograph was put through a calibration test for reset & coupling precision, so that when it resets it actually resets, and when it collects time it doesn't create drag on the main train wheel.

Waterproofing, button service and case finishing

All gaskets (caseback, crown, pusher gaskets) were replaced and a leak test was performed. Even if a Corum Romvlvs is not a dive watch, it deserves to have everyday durability. The waterproofing had to go back to where Corum defined it: protection against moisture, dust and unforeseen events.

The case and the bracelet were passed for finishing

• ✨ Finishing stages:

1. Degreasing
2. Fine polishing with paste 3m
3. Reset satin to the correct link points
4. Cleaning in an ultrasonic washing machine

The result was a case with an even finish, deep shine but not "mirror-overblown", and a bracelet that looks vibrant, robust, yet sophisticated.

Final inspection and delivery

The watch was put through a 48-hour test in the laboratory, combining time, automatic winding, and chronograph rewinding functions. We never deliver a watch that just "looks" right. We deliver a watch that is correct, proven and tested.

And this Corum Romvlvs Chronograph left The Watchmaker 's bench as befits its character!