THERE’S WATER-RESISTANCE AND THERE’S WATER-RESISTANCE
Longines watches are approved under the criteria applied for the international ISO 22810
norm. Given that the constraints of actually wearing a watch cannot all be simulated in
a laboratory, Longines recommends that its customers allow a safety margin according
to the table above.
A range of methods are used to check the water-resistance of watches depending
on the level of protection required. Although the use of sealing gaskets confers a
certain degree of imperviousness, it is how the watch is constructed that is instru-
mental in determining its ability to keep water and dust out. There are a number
of parts in particular that play a crucial role in ensuring a watch’s water-resistance:
the case back and the crown, the glass and in principle all the elements that make up
the case.
In general, water-resistance cannot be guaranteed for an unlimited time. It may be
affected by the natural wear of the gaskets or by an accidental shock which may deform
the moving parts of the case. For reasons of safety, we recommend that you have your
watch checked for water-resistance regularly a year by an approved Longines agent.
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