Please follow the below recommendations, to ensure that your BRELLUM watch will serve you loyally throughout the years.

  • Crown: to prevent humidity from entering the case, make sure the crown is always pushed back in the wearing position. Do not use chronograph pushers in contact with water
  • Water-resistance: a watch’s water-resistance cannot be guaranteed in all situations or forever. The water-resistance can be affected by a shock to the crown, the ageing of gaskets (for example, due to the action of chemical products), etc.
  • Shocks to the watch: different types of shocks - whether chemical, thermal, physical, magnetic or other - can affect your watch. Take care to avoid them.
  • Temperature: avoid exposure to temperatures greater than 60°C (140°F), or below 0°C (32°F). Also avoid extreme changes in temperature, such as putting the watch in extremely cold water after prolonged exposure to the sun.
  • Magnetism: avoid placing your watch on iPads, computers, loudspeakers, mobile phones or refrigerators. These devices generate powerful magnetic fields that can affect the precision of your watch.
  • Care and cleaning of metal bracelets, water-resistant metal cases: clean with soapy water and a toothbrush and dry with a soft cloth.
  • Chemical products: avoid direct contact with chemical cleaning agents, solvents, detergents, cosmetics and other chemical products, as they may damage your case, bracelet or rubber gaskets.
  • Like any other mechanical precision instrument, it is important to service a watch at regular intervals to make sure it performs correctly in time. As a general rule, and depending on how you use your watch and the conditions in which you use it, we advise you to have your watch serviced every 3 to 4 years. Each BRELLUM watch is individually adjusted and checked on its accuracy before leaving our workshop. The balance wheel in an automatic watch swings 28,800 times an hour and the gear train moves forward 691,200 times in 24 hours. In four years, this represents over one billion impulses! We advise you to send your watch every 3-4 years to our Service Centre, where a trained watchmaker will meticulously inspect it before thoroughly cleaning and lubricating the movement.


We recommend you adhere to the following indications to keep your leather strap in good condition for as long as possible:

  • Avoid contact with water and humidity to prevent discoloration and deformation.
  • Avoid prolonged exposure to the sun to prevent discoloration.
  • Avoid contact with greasy substances, cosmetic products and any other chemical agent.

Leather is an organic and permeable material and therefore will not last forever in its original condition. However, if you adopt the steps above it will last for many years. You can buy new leather strap on your website www.brellum.swiss


The notation of water resistance to a given depth (e.g. 5ATM/50m/150ft) is based on the fact that the case has been designed to withstand a static laboratory test to the stated dept. Most water-resistant watches are not designed for prolonged and active use in water. The figures quoted refer to static pressure. The actual water pressure on the watch during use will be greater than the static pressure. For instance, diving pressure on the watch is clearly greater at the impact point with the water during poolside diving. Condensation can also be a problem. A sealed watch will pick up body warmth in water and this remains in the case. If the watch is then suddenly plunged into water that is some degrees colder, moisture can then be created within the watch and become visible as small droplets under the glass.

This normally dissipates of its own accord once the watch is removed from the water, but this not always the case.

The water-resistance rating of your watch was determined and checked when it was manufactured at our workshops. It does not imply a lifetime guarantee against water entering into the watch. Your watch is water-resistant only when the crown is fully pushed-in against the case. Your watch is not water-resistant if the crown is in the winding or time-setting positions. Likewise, pushers should not be operated while the watch is wet or in water. Ageing and normal day-to-day handling affect the water-resistance of your watch. Avoid temperature extremes (immersing the watch in cold water after a prolonged period in the hot sun) that can damage the gaskets as well as any other shocks – chemical, physical or other – which might compromise the technical integrity of the watch case. We advise you to bring your send to our Service Center for a water-resistance check every 3-4 years.