Frequently asked questions

1. Watch cleanliness – How to proceed?
From greasy kitchen accidents to general dusty conditions, a watch will occasionally need to be spruced up a little to recover its shine and hygiene.

Simply find an old toothbrush and keep it specifically for the occasion, plus a wet cloth and a dry polishing cloth.
Fill a glass with room-temperature water and add a couple of drops of washing-up liquid.

While ensuring that the crown is pushed well against the case...

     • Use the dry cloth to protect the leather bracelet.
     • Wet the brush and while aiming at the metal parts that need cleaning, simply brush away the offending elements.
     • Put the brush to one side and with the wet cloth, gently wipe away the suds.
     • Then dry the watch case using the polishing cloth.
     • Please do not dry on a radiator nor a hair dryer.

  Concerning any sticky substances that soapy water will not eliminate; alcohol or ether on a dry cloth will do the trick. (DO NOT USE acetone)
2. Battery Life – How long?
High technology Swiss quartz movements consume very little power. However, the battery life depends on three principal factors:

      • Battery quality.
      • The manner in which the new battery is placed.
      • The practical use of the mechanism.

Battery power duration:

Your watch had been on test for several months following the assembly to ensure a perfect 100% technical performance. Following this test and a few days before shipment, the battery was replaced.

Nearly all batteries have a minimum power-supply of 36 months.
The following is the life-span of a chronograph battery:

     • ±36 months with 30 to 60 minutes chrono function per day.
     • ±20 to 24 months with continuous chrono function.

FYI: When the watch is not needed, stopping the watch by pulling the crown out to the 3rd position will reduce the consumption by approximately 70%.

Battery changing:

Concerning the battery quality, make sure that the trade mark is well known.

Caution: For many reasons, it is always preferable to have the battery changed by a watchmaker. Holding a battery with the fingers creates a short circuit and is one of the most common reasons for shying away from the traditional shop assistant.
3. The zero setting is failing – What do I do?
Your Swiss quartz watch contains one of the most sophisticated electronic systems on the horological market. Concerning its chronograph technology, the old mechanical system of a hammer falling on a snail-wheel to provide the zero-setting has since been abandoned and replaced by tiny electro-magnets.

     These magnets are not only designed to maintain the hands at a zero-position, but they also help to absorb shocks in order to reduce damage. This lowers the risk of internal damage !


    1. Pull out the crown gently (the ‘winder’) to the 3rd position. (this is the time-setting position) The watch will stop ! (FYI: When the watch is not being worn for a certain length of time, this 3rd position conserves 70% of battery power)

    2. Then push BOTH chrono buttons AT THE SAME TIME for 5 seconds. (this will have the effect of automatically spinning the seconds hand round to an undetermined position)

    3. If the central seconds hand has not stopped exactly at the 12h00 zero position, then simply push the TOP chrono button to advance the hand, second-by-second, until you arrive at the zero position.

    4. If by any misfortune the small sub-dials are also incorrectly positioned, then click once on the BOTTOM chrono button. Then return to the TOP button to advance the small hand.

    5. Once again, if the left-hand dub-dial minute counter is also incorrectly positioned, push the BOTTOM button once again, then return to the TOP button to advance the hand.

     6. When all hands are correctly positioned up top, push the crown back against the watch. The chronograph is now regulated and the watch will re-start !

    7. Now check the chronograph in the normal way to see if the hands operate correctly.

    8. Reset the watch to the correct time.
4. Watch Stoppage – What do I do?
There are many reasons why a watch will stop but the events prior to the stoppage will probably provide you with a good hint as to why the watch has a problem.
There are typically four principal reasons for a stoppage.

      The battery power source is defective -
      A shock -
      Condensation due to a sudden temperature change -
      A 'behind schedule' overhaul – (four years)

Firstly, if your watch is still under guarantee, please contact us.

As we all know from experience following the purchase of batteries for household appliances, the occasional 'damp squib' does manage to find its way onto the commercial shelves. Unfortunately, watch batteries are no exception!
After reading this answer, please read “Battery life” section.

   If this is the case, then all that's needed is a simple battery change and the movement will automatically ‘kick-start’ itself to a normal working mode. However, if by any chance the watchmaker indicates differently, then please contact us and ask for advice (even if out of guarantee).

   A shock will automatically distance the watch from its guarantee. Nonetheless, Col&MacArthur will provide an eventual repair-proposition that will include access to unique essentials such as glasses, dials and winders. Please note:

      These spare parts are ONLY available at Col&MacArthur.
      On the other hand, spare parts for the Swiss Ronda movements are available throughout the world.


Condensation will occur when a warm watch is suddenly subjected to a cold environment; for example, plunging into cold water on a warm day. Under normal circumstances, this will appear as a fine mist under the glass and will probably disappear after a few minutes.
However, if the misting appears as ‘slightly’ definable droplets of water and does not disappear quickly, this will not evaporate by its own accord.As such, it will need to be removed quickly by a specialist.

This water is not just limited to the glass but also the mechanical parts of the movement and the integrated circuit.

As such and as mentioned above, a full and immediate verification is required by opening the back cover to ‘prevent’ rusting and serious battery corrosion. Note: If you are not able to repair the watch immediately, at least ask a watchmaker to simply remove the back cover.
5. I have lost my guarantee!
If by any misfortune the guarantee is ever lost and for some reason the watch needs attention, please quote the number code engraved on the back cover.

If this watch is a military chronograph watch, the number is engraved on the top side of the watch’s cover.

This number renders your watch totally unique and the code corresponds with the guarantee; plus the data in our archives.
6. What is meant by "waterproof"?
In our global world of Swiss watches, there are three principal criteria concerning water resistance.

     1. No protection - usually, when the crown possesses a simple internal spring dust cover
     2. Well protected - usually five atmospheres but please see *
     3. Extremely well protected - designed specifically for scuba and depth diving

All Col&MacArthur watches are waterproof up to 5ATM means 50meters of water depth.

* Something that should be mentioned about Col&MacArthur watches in relation to water resistance is the fact that leather bracelets are NOT designed for swimming.
7. Spare Parts – Where to find?
Internal parts:

Spare parts for everything related to the movement can be found from most reputable watch repairers. They are available worldwide. In the meantime, if by any misfortune your watchmaker casts doubts on the availability of such-and-such a piece, (and to eliminate the possibility of deception and exorbitant repair prices) please contact us and ask for advice.

External parts:

Unfortunately, unlike the 'internal' parts, the case, glass, winder, dial and personalized bracelets are only available from Col&MacArthur.

Simply contact us and we will reply immediately with advice.