Horological Meandering

ChristianDK
[F.P. Journe Moderator]
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I agree Graham

Its quite confusing. Apparently the WR is established in a controlled environment by a certain test standard used by manufacturers. I think it was IWC who used to have a technical explanation of this in their website. I was just looking for it but was unable to find it. However I found this on the AP website under "costumer service". It is not totally clear but as I remember its similar, probably because it refers to the same test standard:

Watches marked “water-resistant” are destined for ordinary daily use and must be resistant to water during activities such as swimming for short periods.

They can be used in conditions of varying water pressure and temperature.  They are not intended for underwater diving.

In order to obtain the “water-resistant” mark, watches must meet air overpressure, water overpressure, temperature and mechanical stress resistance requirements.

In the case of Audemars Piguet watches, in addition to the term “water-resistant”, there is an indication of the test overpressure in bars (e.g. 5 bars) or of the corresponding depth in metres (e.g. 50 m).  However, these are not indications of diving depth; they refer to the pressure at which the water overpressure test was carried out (in accordance with Standard NIHS 92-10 or ISO 2281).

The water resistance of the watch may be adversely affected in an accident or by contact with aggressive substances (acid, perfume, liquid metal, salt water, etc).  After an incident of this kind, it is imperative to avoid immersing the watch and to have a new water-resistance check or service carried out without delay (B1 service in the AP service list). 

hope this helps and that I am not breaking any forum rules

Best COD