An o Sai Gon | Eat in Sai Gon


• Carefully read the user guide and follow the maintenance instructions • For manual winding watches, wind the watch once a day, preferably in the morning • Avoid wetting a crocodile strap or prolonged exposure to sunlight (the lifetime of a leather strap is normally 8-14 month – humidity, oils, cosmetics can premature the ageing of the strap) • Avoid subjecting the watch to extreme temperature variations • Avoid all watch impacts and shocks (have water-resistance checked after a severe shock) • Avoid wearing the watch during activities that may generate strong and repeated vibrations • Avoid exposing your watch to magnetic fields as this may disturb the watch settings (quartz watches will temporarily stop) • Ensure the time setting crown and pushers are in place and screwed in after each manipulation • Waterproof watches: Have your watch water-resistance checked by an authorized watchmaker once a year or each time the watch is opened • Never use control functions, pushers or the time setting crown under water or out of water if the watch is not dry • Rinse your watch in fresh water after use in the sea or pool • Check the water-resistance of your watch yearly and replace all seals every second year.


Timepieces are exposed daily to magnetic fields, which are more widespread today than ever before in our daily environment. If the steel components in the movement become magnetic it may influence the precision dramatically. Avoid placing your watch on or near permanent magnets, as found in cell phones, speakers, computers, magnetic locks in handbags etc… QUARTZ watches will temporarily stop during the time they are exposed to a magnetic field and will continue when they are not. MECHANICAL watches will either gain or lose time (in some cases stop all together) when they have been exposed to a magnetic field. Generally they will “only” need to be demagnetized in order to return to normal. Demagnetizing is a fairly simple process which mostly can be done within a few minutes. Ole Mathiesen can naturally always help you with that.


A quality watch is an investment to be enjoyed by you and future generations. In order to safeguard the integrity and longevity of your watch a regular service is recommended at intervals of between three and five years for mechanical watches and 5-7 years for quartz watches, depending on the type of watch and its general wear and tear. The battery in quartz watches however, normally last only two or three years – these watches will need to be returned more frequently for a battery change. The skill involved in the 5 year service overhaul requires years of experience and is vital to completing a proper service or repair. For the watches serviced in Copenhagen by Ole Mathiesen the normal delivery time is 4-6 weeks (it take up to 3 weeks to perform a service). Complicated and vintage watches need to be send to the manufacturers for service with a normal delivery time of 2-4 month (sometimes longer). We have tried under “complete service” to explain the steps involved in a service and why it acquire many hours to secure the perfection.


When your quality watch is being serviced, the watch / movement is completely dismantled. Every single part is checked and controlled, during which time any potential problems will be diagnosed. Original and any replacement components undergoes a cleaning process, where they are cleaned of microscopic particles and old oils that could contaminate the movement when it is assembled. There are many assembling procedures and a vital lubrication process requiring a skilled knowledge which needs to be followed. During reassembly and afterwards, adjustments must be made between the components to ensure proper functioning and to obtain the precision required.

The case and bracelet are cleaned and washed in an ultrasonic cleaner removing any residue that could potentially scratch the elements. This process can take up to several hours. Polishing is carried out on request and can require varies different techniques. Most cases receive at least a light polish to bring back lost luster while others may need several rounds of polishing using different machines to restore their original brilliance. The case-assembly involves fitting the glass, case-back and crown of the watch, waterproofing (for water resistant cases) and completing a final aesthetic control. In a special dust-free environment, the movement and case exterior are reunited. Final pieces, the rotor and crown are reassembled and, after any humidity is removed, the case is closed.

When our master watchmakers have worked their magic – the watch need to go through an extensive quality control – securing that everything works perfectly before returning to its owner. The quality control at Ole Mathiesen can take up to 10 days.


You cannot compare a quality mechanical watch with a quality car – but it still give you something to think about.
If you take care of your quality watch it may last for a generation (more than 600.000 hours) – in comparison a quality car is expected to last for 300.000 km (less than 5000 hours). The recommended service for a quality watch is every 5 years – after app. 44.000 hours (14 services for a generation). The recommended service for a quality car is every 15.000 km – after app. 215 hours (20 services over a 20 year period). The balance wheel (setting the heartbeat in the watch) rotate 28.800 times per hour or 1.260 million times between each service. The car engines average rpm is 4.000 – the crankshaft of the engine completes 4.000 revolutions per minute or 52 million revolutions between each service.