In order to make the surfaces inalterable, an electroplated coating, consisting of a fine layer of nickel between 0.8 and 1.2 microns thick, is applied by electrolysis to the steel or brass parts. In addition the brass parts receive a 0.2 to 0.3 micron layer of rhodium or 24-carat gold. Thus each part is protected from corrosion or mechanical wear, which ensures its longevity. Jaeger-LeCoultre is one of the last Manufactures with a complete mastery of electroplating, able to plate in numerous other metals, such as silver, palladium, ruthenium and different sorts of gold.
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