Did you know that a mechanical watch working without stopping requires servicing every four years, i.e. after 35,000 hours? For a car driving for ninety minutes every day, this would be the equivalent of waiting 64 years before the first service!


Water-resistance

Basic advice for safeguarding the water-resistance of your watch:

The water resistance should be regularly checked (1x per year) by an authorized Hamilton Service Center.
You should ensure that the crown, according to the model, is pressed back into position 0, or with screwed crowns, that it is screwed back carefully, so that water can not get into the mechanism.

Do not use push button functions or turning bezels under water.

The water-resistance of your watch is marked on the bottom of the case:

3 bar (30 m) / 43 psi (98.4 ft)
5 bar (50 m) / 73 psi (164 ft)
10 bar (100 m) / 145 psi (328 ft)
15 bar (150 m) / 217 psi (492 ft)
20 bar (200 m) / 290 psi (656.1 ft)
100 bar (1000 m) / 1450 psi (3280.8 ft)

During the final check, HAMILTON watches are checked for water-resistance as marked on the bottom of the case, but the water-resistance of a watch is not permanent.
The water-resistance can be impaired by accidental knocks to the case and crown, as well as natural wear of the gaskets.

Leather bands:
Please note that leather is a natural material subject to natural ageing. Depending on your wearing habit, the band should be replaced regularly for reasons of safety (security of the watch on your wrist), as well as aesthetic and hygiene reasons. If worn daily, it needs to be changed every 6 to 12 months.

To keep your leather band in good condition for as long as possible, Hamilton recommends the following:

Don't expose your wristband to sunlight for long periods as this can fade it.

Don't forget that leather is permeable. So avoid contact with oily substances and cosmetics.

To prevent discoloration and deformation, avoid contact with water and moisture.
 

Bathing in the sea:
Always rinse your watch with clear water, when it comes in contact with salt water.
 

Cleaning:
For metal bracelets and for all water-resistant cases use a small brush (for ex. a toothbrush) with soapy water.
Use a soft cloth to dry it so that you do not scratch the watch or metal band.
 

Chemical products:
Avoid direct contact with solvents, detergents, perfumes, cosmetic products etc., since they may damage the bracelet, the case or the gaskets. If you have been swimming in chlorinated water, rinse your watch in clear water afterwards.
 

Magnetic fields:
Do not expose your watch to intense magnetic fields such as metal detectors or electromagnetic appliances.
These can damage your watch or impair its accuracy.
 

Temperatures:
Do not expose your watch to sudden temperature changes (exposure to sunlight followed by immersion in cold water) or extreme temperatures over 60°C (140°F) or under than 0°C (32°F).
 

Shocks:
Whether thermal or other shocks, avoid them. In the event of violent shocks, please have your watch checked by a HAMILTON approved Service Center.
 

Batteries:
Watch batteries can last from between two and five years, depending on the watch type, its size and the amount of energy used by the various functions. If the second hand begins to jump in 4 second intervals, the battery needs to be changed (end of life indicator)

Changing the battery:
We recommend that you take your watch to an authorized HAMILTON Service Center or HAMILTON retailer as they have the tools and testing equipment necessary to carry out the work professionally. An empty battery must be changed as soon as possible to avoid the risk of leakage and resulting damage to the watch mechanism.

Battery type:
Silver oxide 0% Hg
 

Maintenance service:
Please note that like with any micromechanical precision instrument, HAMILTON watches should have regular maintenance. This keeps your watch in perfect working order and makes it last longer.
The frequency with which this maintenance work needs to be carried out depends on the model, as well as climatic conditions and the owner's care of the watch. Therefore we can not give a specific time interval for servicing. We generally recommend that a complete maintenance service should be carried out every 3 to 5 years.

To ensure that the service is carried out professionally, take your watch to an authorized HAMILTON Service Center or HAMILTON retailer.