Repair & Restoration

Facts You Should Know About Servicing Your Timepieces

Mechanical watches are designed to last many generations. In order to ensure that the value of your watch is maintained and the legacy of your valuable timepiece is preserved for years to come, we recommend a regular maintenance service of every three to five years to keep your timepiece in good original working condition.

The need for regular service applies to Quartz watches as well. Quartz watches have wheels and gears, along with electronic components that need maintenance. Batteries for these watches can normally last only 12 to 18 months. It is therefore essential to replace the battery regularly to prevent incidences of battery leakage, which can cause substantial damage to the watch.

Your watch registers 86,400 seconds a day throughout the year; year after year. The balance wheel rim of your watch travels an equivalent of 38,000km over a five-year period. With its movement containing over 150 actively moving parts, your watch deserves quality maintenance that only a highly skilled and dedicated watchmaker can provide.

Enhancement Services

  • Dial Refurbishment
  • Customisation of Dial with Diamonds, Pave, Mother of Pearl and Stone
  • Diamond customisation on Bezels, Bands & Cases

Service Warranty Info

  • Complete overhauled watches have a service warranty for up to 5 years. subject to terms and conditions
  • Partial jobs are not covered under the warranty

Servicing of your Timepieces

The Initial Examination

Before your watch is being serviced, our highly skilled Bonfield-trained watchmakers will conduct a thorough diagnostic examination of the watch to determine the exact servicing procedures that are required to restore the watch back to its original high performance standard.

Movement Maintenance Service

Microscopic examination
“Platax” Tool – Removing roller and balance staff
Staking Tool – Replace balance staff
Seitz Jewelling Tool – Micrometer adjustment of set jewel permitting correction of endshake

The watchmaker begins the service process by completely disassembling the watch's movement. Each precise part is carefully examined under a 10x magnifying microscope for wear or damage, and will be replaced or refinished if deemed necessary.

Dried oils/contaminants are then removed from all parts by a series of ultrasonic cleaning process.

Case and Bracelet Refurbishing

Felting – To eliminate scratches with abrasive paste
Polishing of the back case
Sandblasting of the case
Lapping – The bevels are reground and polished

Your watch casing is carefully disassembled and all gaskets/o-rings replaced. If necessary, the crystal, crown and any worn parts will also be replaced to ensure that the watch remains completely waterproof.

The watch case and bracelet are put through an ultrasonic cleaning process to remove particles that can oxidise the case and bracelet.

The case and bracelet are then meticulously refinished. Techniques of bevelling, lapping, polishing, brushing, sandblasting and circular-graining to remove dents and scratches are employed so as to restore the case and bracelet to its original lustre.

Reassembling the Movement

Reassembling of the watch movement
Lubricating the movement – Each pivot of the watch train wheels and balance staff are lubricated with recommended high grade lubricants

The watchmaker will proceed to reassemble the movement; an operation which requires extreme dedication as it is both a highly delicate and time-consuming task. This step has to be conducted with painstaking care. Specially formulated oils and lubricants are applied in exactly the right quantities to achieve optimal performance of the movement.

Calibration and Timekeeping

Timing calibrations- Balance wheels are meticulously timed
Witschi “Watch Expert” – Measures the rate accuracy, amplitude and the beat error of mechanical watches
Wrist Motion Simulator – Testing the winding mechanism and the power reserve of automatic watches

After re-assembly, the movement is carefully calibrated by adjusting the balance wheel, which is also the "heart of the movement", and the hairspring which oscillates it. The performance and daily accuracy of the movement are then tested in required positions on a sophisticated timing machine to ensure that they are set to the required high-performance standards.

Finally, the dial, hands and rotor self-winding mechanism are fitted back in their positions, and the movement is returned to the case. The newly assembled watch will undergo 5 continuous days of testing, on a wrist-motion simulator, which recreates the normal activities that the watch may encounter when worn on your wrist.

Pressure Testing

Pressure Testing – Waterproof watches are pressure tested to 330 feet

The watch will now undergo a final pressure test in a special vacuum tank. This ensures that the waterproof qualities of the watch are retained in accordance with stringent factory criteria.

Final Inspection

Final Inspection will be the most stringent check point conducted by the trained eye and sight of the Bonfield’s watchmaker

The final step will see the watch passing the final, systematic and uncompromising meticulous inspection by the watchmaker. Our watchmakers from Bonfield are reputed to be the finest in the industry due to their years of practice, expertise and dedication. When you send your watch to Bonfield, you are assured of uncompromising service and absolute dedication. You can be certain that your watch has been treated with utmost respect, and has been paid the absolute attention to detail.

Restoration of Vintage Timepieces

Turing Caliber – Inspect the flatness of balance wheel
Poising Tool – To ensure that the balance wheel is poised or balanced.
Reducing the weight of the balance wheel
The “Jacot” Pivot Lathe – is used for burnishing pivots of the watch train wheel
Fabrication of precision parts with the aid of the watchmaker’s lathe
To forge the guard pins
Dial feet restoration
Crystal and glass customisation
Laser spot soldering

Bonfield is fully equipped with a wide range of the finest Swiss equipment. This provides us with an unparalleled advantage and capabilities to restore both vintage and pocket watches. Our restoration of your precious and sentimental timepieces will render them similar to their original standards.

As the restoration work of these exquisite vintage pieces usually requires more time and attention than the routine maintenance of a watch, we at BONFIELD manufacture hand-made parts for parts which are not easily available or not available anymore. Steel surfaces, corners of bridges, cocks and screws are repaired and polished.

This specialised and rare skill is extraordinary, due to the years of dedicated schooling and training needed. Such artisan skill is confined to a very small and selected group of watchmakers worldwide.

Showcase of Restoration Work

The refinishing process is a complex one, starting with the methodical disassembling of the entire watch part by part. In some cases, special tools are developed just to refinish certain case parts. Refinishing has to be done in a separate room so that dust particles do not contaminate the movement of the watch.

Each case part of the watch is polished individually to reinstate its original factory specifications, and only after this does the reassembling of the watch take place. Even the screw heads are polished, such that by the time we are done with the refinishing, your watch will look as new and stunning as the day you first took it home.

These pictures show the refinishing works that we have done for our customers.

Part I

Before Before Before
After After After

Part II

Watch Service Watch Service Watch Service Watch Service Watch Service
Watch Service Watch Service Watch Service Watch Service Watch Service


Sandblasting is a metal-cleaning process which if not done professionally, could lead to some dimensional damages to the watch, i.e., loss of metal from the surface being cleaned. It is an effective cleaning process for hard surfaces by way of using high pressure air. Sandblasting can be used for smoothing, shaping and cleaning hard surfaces. The effect of sandblasting is similar to that of using sandpaper, but the former provides a largely more even finishing.

Note the picture below. The timepiece sent in by our customer shows an obvious rough and speckled finishing that is certainly way out of factory’s specifications. After our servicing, you will notice a much softer, uniform, matte, clean and bright finish. This is the desired effect and is only made possible by using the correct procedures, methods and tools. The sheen and lustre seen in the “after” picture is associated with factory’s specifications. More importantly, there are no dimensional changes in the metal which would ruin the look of the valuable timepiece.

Watch Service Watch Service
Watch Service Watch Service

©2017 BONFIELD PTE LTD. TEL: +65 6473 5505 | WHATSAPP: +65 8613 5505
Scroll To Top