According to Montblanc, removing the oxygen from inside the case prevents potential oxidation processes from occurring inside the case, which means an environment without oxygen should therefore protect the movement’s components and especially have the lubricant oils age much more slowly. In addition, the absence of moisture should prevent the formation of condensation droplets, even if the watch were to be exposed to extreme temperature fluctuations. To achieve this, the watchmakers at Montblanc’s manufacturing facility in Le Locle work with a hermetically sealed glass box to insert the fully assembled movements, using long nitrile gloves, which are integrated into openings on either side of the box. Once all the oxygen inside the box has been replaced by nitrogen, the watchmaker begins fitting the movements in their cases.